Are you tired of spending your weekends scrubbing algae off your aquarium glass? The constant battle against algae buildup can turn what should be a relaxing hobby into a never-ending maintenance chore. What if I told you there’s a natural, eco-friendly solution that not only keeps your tank’s glass crystal clear but adds beauty and interest to your aquatic ecosystem? Enter the world of glass-cleaning tropical fish – nature’s own janitors that work tirelessly to keep your viewing area unobstructed, allowing you to fully enjoy the mesmerizing world beneath the water’s surface.
The search for the perfect aquatic companions often focuses on vibrant colors, unique behaviors, or peaceful temperaments. But have you considered the functional benefits certain fish species can provide? Glass-cleaning fish are specially evolved to graze on algae, serving a dual purpose as both attractive additions to your aquarium and as natural maintenance crew. These underwater workers can significantly reduce your manual cleaning time while creating a more balanced, natural environment within your tank. In this comprehensive guide, we’ll explore the fascinating world of glass-cleaning tropical fish and how they can transform your community tank experience.
Top 10 Glass Cleaning Tropical Fish
Detailed Product Reviews
1. API ALGAE SCRAPER For Glass Aquariums 1-Count Container
Overview: The API ALGAE SCRAPER is a straightforward, practical cleaning tool designed specifically for glass aquariums. It comes in a single-container package featuring an extra-long handle with a durable scrubbing pad that effectively removes unsightly algae while keeping your hands dry. The product targets aquarium owners seeking a simple, no-frills solution to one of the most common maintenance issues.
What Makes It Stand Out: The extended handle design is the most notable feature, allowing users to reach far into the aquarium while maintaining a dry grip. Unlike magnetic cleaners, this scraper offers direct control over pressure and scrubbing technique, making it effective for more stubborn algae buildup that weaker magnetic tools might not address.
Value for Money: At $9.19, this represents an affordable entry point into aquarium maintenance. The simplicity of the design translates directly to reliability without complex failure points, making it a cost-effective solution for both beginners and experienced hobbyists alike.
Strengths and Weaknesses: Strengths include its affordability, effective algae removal, ergonomic handle that keeps hands dry, and straightforward operation. Weaknesses include being limited to glass only (not suitable for acrylic tanks), requiring manual effort for cleaning, and offering no replaceable parts or alternative cleaning surfaces.
Bottom Line: The API ALGAE SCRAPER is a reliable budget option for glass aquarium owners who need a direct, effective tool for algae removal. While its simplicity and limited functionality may not appeal to all users, it delivers on its core promise of affordable, effective cleaning for glass aquariums.
2. Pawfly Aquarium Magnetic Brush Fish Tank Glass Cleaner 1 Inch Mini Stain Scrubber Pads Aquarium Cleaning Tool for 1/5 Inch Thick Fish Tank up to 10 Gallons (Non-Floatable)
Overview: The Pawfly Aquarium Magnetic Brush is a compact cleaning solution designed specifically for small glass aquariums up to 10 gallons. This miniature cleaner (1.17″ x 1.17″ x 1.1″) utilizes strong magnetic forces to connect an internal scrubbing pad with an external guiding pad, enabling users to clean the inside glass without submersion.
What Makes It Stand Out: Its dual-sided cleaning surfaces set this product apart—a coarse pad for scrubbing stubborn mineral deposits and algae on the interior, and a soft pad for wiping dust from the exterior. The square rather than round design allows it to clean corners and edges that round magnetic cleaners typically miss.
Value for Money: At $5.99 per unit, the Pawfly offers exceptional value for small aquarium owners. The inclusion of both scrubbing and wiping functions in one compact package provides versatility that justifies the modest price point.
Strengths and Weaknesses: Strengths include its affordability, perfect size for nano tanks, dual cleaning functionality, strong magnetic connection, and ability to reach corners. Weaknesses include limitations to very small tanks only, unsuitable for acrylic or plastic surfaces, and the potential for magnets to weaken over time with frequent use.
Bottom Line: The Pawfly Aquarium Magnetic Brush is an ideal choice for owners of small glass aquariums seeking an affordable, convenient cleaning solution. Its compact size and corner-cleaning capability make it particularly effective for detailed maintenance in limited spaces, providing excellent functionality within its designed parameters.
3. Gulfstream Tropical AGU00259 Mag-Float Mini Glass and Acrylic Aquarium Cleaner
Overview: The Gulfstream Tropical AGU00259 Mag-Float Mini is a specialized magnetic aquarium cleaner designed for smaller tanks, with the key advantage of compatibility with both glass and acrylic surfaces. The felt-lined handle ensures a no-scratch cleaning experience, while the internal scrubber follows external magnetic movements for efficient algae removal without water contact.
What Makes It Stand Out: Its dual-surface compatibility with both glass and acrylic makes this product rare among magnetic cleaners, as most are designed only for one type of material. The felt-lined handle provides additional protection for delicate acrylic tanks, which are more susceptible to scratches than glass.
Value for Money: At $16.29, this product occupies a mid-range price point but offers excellent value for acrylic tank owners who have limited specialized cleaning options. For those who want the convenience of magnetic cleaning without the risk of damaging more delicate surfaces, the premium is justified.
Strengths and Weaknesses: Strengths include compatibility with both glass and acrylic, gentle felt-lined protective surface, compact size for detailed cleaning, and effectiveness on light to moderate algae. Weaknesses include the higher price compared to basic scrapers, limited effectiveness on heavy algae buildup, and potential difficulty in very small aquariums if magnets aren’t sufficiently strong.
Bottom Line: The Gulfstream Mag-Float Mini excels as a cleaning solution for aquarists with small acrylic tanks or those requiring precise cleaning in tight spaces. While its price is higher than entry-level scrapers, its versatile surface compatibility and gentle cleaning action make it an indispensable tool for maintaining delicate tank surfaces.
4. Gulfstream Tropical AGU350LG Mag-Float Glass Aquarium Cleaner, Large
Overview: The Gulfstream Tropical AGU350LG Mag-Float Glass Aquarium Cleaner represents a significant advancement in magnetic cleaning technology for large aquariums. Its revolutionary floating design prevents the cleaner from sinking to the bottom when not in use, making retrieval and positioning significantly easier while cleaning large glass surfaces.
What Makes It Stand Out: The buoyant feature is the product’s defining characteristic, allowing it to float freely and making it simple to guide around corners along the glass surface without sinking or getting stuck. This floating capability addresses one of the primary frustrations of magnetic cleaners used in deep tanks.
Value for Money: At $49.95, this is a premium-priced aquarium maintenance tool. However, for owners of large glass aquariums, the convenience, time-saving features, and specialized design for big tanks justify the investment. The unique floating design simply isn’t found in more basic magnetic cleaners.
Strengths and Weaknesses: Strengths include innovative floating design that prevents sinking, large cleaning surface suitable for big tanks, effective magnetic connection that works on glass up to 3/4″ thick, and easy maneuverability around corners. Weaknesses include high cost, limitation to glass only (unsuitable for acrylic), potential difficulty with very thick glass, and being oversized for smaller aquariums.
Bottom Line: The Gulfstream Mag-Float Large is an exceptional tool for serious aquarists with substantial glass aquariums. While its price point is significant, the innovative floating design and specialized large dimensions make it worth the investment for maintaining extensive glass tanks conveniently and effectively, especially when compared to the time and effort required with alternative cleaning methods.
5. Pronetcus Algae Scraper for Glass Aquariums, Fish Tank Cleaner, Aquarium Algae Scrapers with 10 Stainless Steel Blades.
Overview: The Pronetcus Algae Scraper is a specialized cleaning tool featuring replaceable stainless steel blades engineered for thorough algae removal in both freshwater and saltwater aquariums. This system includes a large scraping head for comprehensive coverage and comes packaged with ten additional replacement blades, significantly extending the product’s useful lifespan and total value.
What Makes It Stand Out: The stainless steel blade system is the most distinctive feature, providing significantly more effective removal of stubborn algae buildup compared to plastic or felt alternatives. The inclusion of ten replacement blades dramatically improves long-term value, allowing for years of effective cleaning from a single purchase.
Value for Money: At $12.99 for the scraper with ten additional blades, this represents excellent long-term value. While the initial cost exceeds basic plastic scrapers, the replaceable blade system makes it more economical over time, particularly for aquariums experiencing persistent algae problems that require more aggressive cleaning solutions.
Strengths and Weaknesses: Strengths include superior effectiveness on stubborn algae due to stainless steel construction, versatility across saltwater and freshwater environments, extended lifespan through replaceable blades, multiple length options for different aquarium heights, and included safety cover for storage. Weaknesses include being limited to glass surfaces, the sharper blades requiring more careful handling to avoid scratching, and the eventual need to purchase additional refills after the ten supplied blades are used.
Bottom Line: The Pronetcus Algae Scraper with replaceable stainless steel blades is the superior choice for aquarists dealing with persistent algae issues in glass aquariums. Its aggressive cleaning action, extended usability through the blade replacement system, and dual-environment compatibility make it a standout product despite its limitation to glass surfaces and the need for careful handling.
6. Fritz Aquatics Aquarium Glass & Acrylic Cleaner Spray For a Crystal Clear Tank (8-Ounce)
Overview: Fritz Aquatics Aquarium Glass & Acrylic Cleaner Spray is an ammonia-free cleaning solution designed specifically for aquariums and terrariums. The 8-ounce spray bottle offers a versatile cleaning option that not only cleans glass and acrylic surfaces but also leaves them resistant to dust, fingerprints, and water spots.
What Makes It Stand Out: Its unique ammonia-free formula makes it safe for use around aquatic and reptile pets without harming them. The streak-free and drip-free formulation provides crystal-clear views of your underwater world, while its compatibility with magnetic cleaners enhances their efficiency.
Value for Money: At $14.99 for an 8-ounce bottle, the cleaner costs approximately $1.87 per ounce, which is reasonable given its specialized formulation. Considering its versatility for aquariums, electronics, and glass surfaces, the price is justified for the quality and safety it provides.
Strengths and Weaknesses: The ammonia-free formula ensures pet safety, while the streak-free results and dust resistance properties prolong time between cleanings. However, some users might find the bottle size small for regular maintenance, requiring frequent repurchases. Additionally, it’s primarily a cleaner rather than a scrubber for tough algae buildup.
Bottom Line: Fritz Aquatics Cleaner Spray is an excellent investment for aquarium enthusiasts who want a safe, effective cleaning solution that provides crystal-clear results without harming aquatic pets. Its versatility extends beyond aquariums to electronics and glass surfaces, offering good value despite the smaller bottle size.
7. fishkeeper Aquarium Strong Magnetic Glass Cleaner Brush, Fish Tank Algae Magnet Cleaning Tool with 2 Detachable Scrapers, Mag Float Scrubber for 0.2 Inch Glass and Acrylic Tanks
Overview: The fishkeeper Aquarium Strong Magnetic Glass Cleaner Brush is a comprehensive cleaning tool featuring a powerful magnetic system that keeps both sides securely attached during use. Designed for glass and acrylic tanks between 0.125-0.2 inches thick, it comes with two detachable blades for different cleaning needs.
What Makes It Stand Out: Its automatic floating design prevents the tool from sinking to the bottom after cleaning, making retrieval easy. The dual-sided cleaning surfaces (stainless steel blade for glass, plastic for acrylic) provide versatility, while the ergonomic handle ensures comfortable operation.
Value for Money: At $13.49, this magnetic cleaner offers good value considering its durable construction and specialized features. The ability to use it on both glass and acrylic tanks without needing separate tools further enhances its cost-effectiveness for aquarium keepers with different tank types.
Strengths and Weaknesses: The strong magnetic force and floating design are significant advantages over many competitors. The dual blade system offers versatility, though some users might find the floating mechanism less reliable than advertised. The cleaner works best on standard thickness glass, which might limit its use for very thick or specialty tanks.
Bottom Line: This fishkeeper magnetic cleaner is an excellent choice for aquarium enthusiasts seeking a versatile, easy-to-use cleaning solution. Its thoughtful design details like the floating mechanism and dual blades make it stand out in the market, offering good performance for those with standard glass or acrylic tanks.
8. Evergreen Pet Supplies Aquarium Supplies Glass Cleaner Sponge – 4-Pack, Red, 3.25-in x 3.25-in x 1-in – Non-Scratch Aquarium Scrubber & Scraper Pad – Glass Cleaning Tool for Fish & Turtle Tank
Overview: Evergreen Pet Supplies offers a 4-pack of glass cleaning sponges designed specifically for fish and turtle tanks. These non-scrub tools measure 3.25 x 3.25 x 1 inches and are built to tackle tough grime while remaining gentle on glass surfaces.
What Makes It Stand Out: Made in the USA, these sponges feature a durable construction that withstands multiple cleaning sessions without disintegrating. Their handheld design provides better control than magnetic cleaners for reaching corners and difficult areas, while the non-abrasive surface ensures scratch-free cleaning.
Value for Money: At $12.31 for a 4-pack (approximately $3.08 per sponge), these offer excellent value considering their durability and USA manufacturing. The multi-pack format ensures you have backups ready when one sponge wears out, making it economical for regular maintenance.
Strengths and Weaknesses: The sponges are effective on glass and provide better control than magnetic options. However, they require more physical effort and getting hands wet, which some users might prefer to avoid. They’re only suitable for glass tanks, not acrylic, limiting their versatility for aquarists with different tank types.
Bottom Line: Evergreen’s glass cleaning sponges provide an affordable, durable solution for aquarium maintenance. While not as technologically advanced as magnetic cleaners, their effectiveness, thoughtful design, and USA construction make them a reliable choice for those who prefer hands-on cleaning methods or need to access tight corners.
9. Aqueon Algae Cleaning Magnets Glass/Acrylic Large
Overview: Aqueon’s Algae Cleaning Magnets offer a convenient way to clean the inside of aquariums from the outside. The large-sized magnetic cleaner features a scrubber that falls straight down if separated, preventing it from floating away and making retrieval easy.
What Makes It Stand Out: The curved pad design allows it to effectively clean both flat and curved surfaces, accommodating various aquarium shapes. The weighted scrubber ensures it stays in place during use without floating away, addressing a common issue with some magnetic cleaners.
Value for Money: At $23.53, this is a premium-priced option in the magnetic cleaner category. However, the reliable performance and convenience of cleaning from the outside may justify the cost for larger tanks or those who want to maximize cleaning efficiency while minimizing disturbance to aquatic life.
Strengths and Weaknesses: Its major strengths include the convenience of external cleaning, curved surface compatibility, and reliable retrieval system when separated. The main weakness is the higher price point compared to some competitors, and without specific dimensions, it’s unclear which tank sizes it’s best suited for.
Bottom Line: Aqueon’s Algae Cleaning Magnets provide a premium solution for aquarists looking for convenient, effective algae removal without getting hands wet. While the price is higher than some competitors, the reliable performance and features make it worth considering for serious fishkeepers with medium to large aquariums.
10. 3 PCS Double-Sided AOODOOM Aquarium Fish Tank Algae Cleaning Brush with Non-Slip Handle, Sponge Scrubber Cleaner for Glass Aquariums and Home Kitchen
Overview: The 3-pack of double-sided AOODOOM Aquarium Cleaning Brushes offers an affordable cleaning solution with sponges on one side and scrubbers on the other. Each brush features a non-slip handle and measures an unstated size, designed for easy handling and effective cleaning.
What Makes It Stand Out: Three brushes in one pack provide excellent value for routine maintenance, while the double-sided design offers both gentle cleaning and more aggressive scrubbing when needed. The hole at the end of each handle enables easy storage by hanging.
Value for Money: At $8.99 for three brushes ($3.00 each), this is one of the most budget-friendly options available. The multipack ensures you have backups for regular cleaning cycles or can place brushes in multiple locations for convenience.
Strengths and Weaknesses: The primary strengths are the affordability and multipack quantity. The non-slip handles provide good control, though the quality might not match higher-end options. The main weakness is the product’s limited effectiveness on acrylic tanks despite claims, as sponges can scratch softer surfaces over time.
Bottom Line: AOODOOM’s aquarium cleaning brushes offer exceptional value for budget-conscious aquarists performing regular maintenance on glass tanks. While not designed for heavy-duty algae removal or acrylic surfaces, the three-pack provides convenience and effectiveness for typical cleaning needs, making it an excellent starter or secondary cleaning tool.
The Role of Algae in Your Aquarium
Understanding Algae Growth
Algae is a natural part of any aquatic ecosystem and serves as both food for many organisms and a producer of oxygen within the tank. However, excessive algae growth can quickly turn your once-pristine aquarium into a green, murky environment that obstructs visibility and potentially harms your fish. Learning to manage algae growth is essential for any aquarium enthusiast, and incorporating glass-cleaning fish can be a key component of this strategy.
Why Clean Glass Matters
Crystal-clear aquarium glass isn’t just about aesthetics. Clean glass allows for better observation of your fish, enabling you to monitor their health and behaviors more effectively. It permits maximum light penetration, which is crucial for photosynthetic organisms and plants in your tank. Furthermore, unobstructed views enhance your enjoyment of the aquarium, turning it from simply a container into a window into another world.
Natural vs. Mechanical Cleaning Methods
The Efficiency of Natural Solutions
Using fish for glass cleaning represents one of the most natural and sustainable approaches to algae management. These creatures have evolved over millennia to efficiently consume algae without harming your tank’s delicate balance. Unlike mechanical methods that only remove visible algae, fish graze continuously, targeting new growth before it becomes problematic.
Limitations of Mechanical Cleaning
While scraping, scrubbing, and magnetic cleaners have their place, they come with several drawbacks. They require regular time investment, can accidentally disturb your aquatic plants or decorations, and may not reach all areas effectively. Chemical algae treatments, while sometimes necessary, can disrupt the nitrogen cycle and potentially harm sensitive species or invertebrates in your tank.
Types of Glass-Cleaning Fish
Benthic Grazers
Benthic fish species spend their time near the bottom of your tank, where they naturally graze on algae that accumulates on surfaces. These fish often have specialized mouth structures that allow them to scrape algae off rocks, substrate, and yes, even your aquarium walls. Their bottom-dwelling behavior makes them particularly effective at cleaning the lower portions of your glass.
Mid-Water Cleaners
Some glass-cleaning fish prefer to graze in the middle portions of the aquarium. These species often have flattened bodies that allow them to press against vertical surfaces while feeding. Their unique swimming patterns and feeding behaviors make them excellent at cleaning mid-level glass that might be missed by other cleaners.
Essential Characteristics of Effective Glass Cleaners
Feeding Adaptations
The best glass-cleaning fish have evolved specialized mouthparts and feeding behaviors specifically designed for algae consumption. Look for fish with sucker-like mouths, rasping teeth, or other adaptations that enable them to efficiently scrape algae from glass surfaces. These specialized anatomical features determine how effectively a particular species can perform its glass-cleaning duties.
Temperament and Compatibility
Since we’re focusing on community tanks, temperament is paramount. The most effective glass cleaners are typically peaceful species that coexist well with a variety of tank mates. Avoid aggressive or territorial algae-eaters that might harass or injure other fish in your community. The ideal glass cleaner contributes to tank harmony while performing its cleaning functions.
Creating the Perfect Environment for Glass-Cleaning Fish
Appropriate Tank Size
Different glass-cleaning species have varying space requirements. While some happily thrive in smaller aquariums, others need larger territories to establish their natural grazing patterns. Understanding the specific spatial needs of your chosen species is crucial for their well-being and cleaning efficiency.
Water Parameters and Flow
Glass-cleaning fish often come from diverse aquatic habitats, from fast-flowing streams to calm ponds. Researching the natural water conditions of your chosen species is essential for their health. Factors like temperature, pH, hardness, and water current all play roles in how these fish thrive and how effectively they’re able to clean your aquarium glass.
Integrating Glass-Cleaning Fish with Other Tank Inhabitants
Community Tank Considerations
When adding glass-cleaning fish to an established community, it’s important to consider the existing inhabitants. Will your new additions compete for food with existing fish? Will they be bullied by larger, more aggressive tank mates? Thoughtful integration ensures both the newcomers and existing residents can coexist peacefully.
Habitat Overlap
Different glass-cleaning fish occupy different zones within the aquarium. Some prefer grazing primarily on the glass, others on rocks and driftwood, and some on plants. Understanding these natural behaviors allows you to select a complementary mix of glass-cleaning that covers various surfaces for comprehensive algae control.
Feeding Glass-Cleaning Fish Properly
Primary Food Sources
While algae forms the foundation of a glass-cleaning fish’s diet, most species require supplemental nutrition for optimal health. These supplemental feedings ensure your fish receive all necessary nutrients while still performing their cleaning duties. Just because a fish cleans glass doesn’t mean it should subsist solely on whatever algae it finds.
Preventing Over-Reliance on Algae
A common mistake among aquarium keepers is assuming glass-cleaning fish can subsist solely on natural algae growth. In most home aquariums, algae growth alone cannot sustain these fish adequately. Providing balanced, species-appropriate foods ensures their health and creates a more sustainable cleaning system over time.
Monitoring and Maintenance When Using Glass-Cleaning Fish
Tracking Cleaning Efficiency
Even with glass-cleaning fish, regular monitoring is essential. Observe which areas of glass they clean most effectively and which they might ignore. This observation helps you identify potential problem areas and adjust your maintenance routine accordingly. Some fish may require occasional manual intervention they typically can’t reach.
Complementary Cleaning Techniques
Glass-cleaning fish are part of a comprehensive maintenance strategy, not a complete replacement for traditional cleaning methods. Incorporating periodic water changes, proper lighting management, and controlled feeding creates the ideal environment for both your fish and your tank’s appearance.
Common Mistakes When Using Glass-Cleaning Fish
Overstocking
One common misconception is that adding more glass-cleaning fish will create a cleaner tank. In reality, overstocking can lead to increased waste production, potentially worsening rather than improving water quality. Each tank has specific limits based on size, filtration, and maintenance capabilities.
Neglecting Regular Maintenance
Relying too heavily on glass-cleaning fish can lead to complacency about regular tank maintenance. These fish are helpers, not miracle workers. Regular water testing, partial water changes, and equipment maintenance remain essential components of successful aquarium keeping.
Long-Term Care of Glass-Cleaning Fish
Aging and Changing Needs
As glass-cleaning fish mature, their dietary requirements and cleaning behaviors may change. Younger fish might be more active cleaners, while older individuals may become less efficient. Understanding these life cycle changes helps maintain a consistent level of glass cleaning in your tank over time.
Breeding Considerations
Some glass-cleaning fish species are prolific breeders in home aquarium conditions. Researching the breeding potential of your chosen species helps prevent unexpected population explosions that could overwhelm your tank’s resources and cleaning capacity.
Creating a Balanced Cleaning Crew
Species Selection Guidelines
The most effective cleaning approach often involves combining different species with complementary behaviors. While this article doesn’t recommend specific species, understanding how different fish types interact with various surfaces helps create a balanced crew that covers all your tank’s cleaning needs.
Seasonal Adjustments
Algae growth often varies with changing seasons and light conditions. Being prepared to adjust your glass-cleaning fish’s supplemental feeding and potentially adding or removing cleaners based on seasonal algae blooms prevents over- or under-staffing your cleaning crew.
Frequently Asked Questions
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Do glass-cleaning fish completely eliminate the need for manual cleaning?
Glass-cleaning fish significantly reduce but don’t eliminate the need for manual cleaning. They work best as part of a comprehensive maintenance routine rather than a complete replacement. -
How many glass-cleaning fish should I add to my tank?
The appropriate number depends on your tank size, species selection, and algae growth. Start with a conservative number and observe their effectiveness before adding more. -
Will glass-cleaning fish harm live plants?
Most glass-cleaning fish ignore healthy plants, but some might nibble on delicate or stressed plants. Research specific species’ plant compatibility before adding them. -
Can I mix different species of glass-cleaning fish?
Yes, many different glass-cleaning species coexist well and can provide complementary cleaning across different tank zones and surfaces. -
What should I feed my glass-cleaning fish besides algae?
Supplement with high-quality algae wafers, specialized sinking pellets, and occasional fresh vegetables like zucchini or cucumber to ensure balanced nutrition. -
Do glass-cleaning fish have specific water requirements?
Different species have varying needs regarding temperature, pH, hardness, and flow. Research your chosen species’ natural habitat for optimal care. -
How effective are glass-cleaning fish compared to algae-eating snails?
Fish can clean larger areas and are often more visible than snails, while snails can reach smaller crevices. Many aquarists use both for comprehensive cleaning. -
Will glass-cleaning fish reproduce uncontrollably in my tank?
Some species are more prolific breeders than others. Research reproductive rates and consider the gender ratios of your chosen fish. -
How long do glass-cleaning fish typically live?
Lifespans vary greatly between species, from a few years to over a decade under proper care, making research on specific species important. -
Are there any downsides to using glass-cleaning fish?
Potential downsides include the need for supplemental feeding, possible waste contribution, and the fact that they won’t clean all surfaces or glass types equally.