They work from 10, 20, 30 to 75 gallons. They're a bit slower on a 75 gallon tank and you need to go slow. I found the end of the scraper really useless. If you're looking for a magnetic cleaner that really lasts, you'll have to look elsewhere.
Greenpro Micranthemum Monte Carlo: Live Large Pearl Grass Aquatic Plant In Tissue Culture Cup For Freshwater Fish Tanks And Aquariums
49 Review
Efficient 2-In-1 Magnetic Fish Tank Cleaner With Non-Slip Design And Scratch-Free Blades
37 Review
Steam cleaner Deerma Deerma DEM-ZQ610 EU, white/red
68 Review
π U-BCOO Aquarium Gravel Cleaner Fish Tank: Manual Siphon for Efficient Filter Gravel Cleaning and Water Change in Tanks
22 Review
Penn Plax Officially Licensed Nickelodeon SpongeBob
6 Review
Cousduobe Betta Fish Leaf Pad: Promote a Healthier Habitat for Bettas with Doule Leaf Design, Simulating Natural Environment
5 Review
π Spectrastone Shallow Creek Regular: Enhance your Freshwater Aquariums with a 5-Pound Bag
9 Review
π Enhance Your Fish Tank with PINVNBY Natural Aquarium Driftwood - Pack of 3 Assorted Branches: Perfect Reptile Ornament and Decoration
7 Review