How-To Guide
Cleaning Aquarium Glass
Clean the inside glass with an algae magnet, sponge or scraper made for your tank's material, and the outside with a soft cloth and plain water or an aquarium-safe cleaner. Use blades only on glass, not acrylic, and clean as often as algae and mineral marks build up.
Cleaning the Inside Aquarium Glass
Algae films on the inner glass can usually be removed with an aquarium-safe pad, scraper, or magnetic cleaner selected for the tank material.
Cleaning the Outside Glass
Use a clean soft cloth on exterior panels and prevent sprays or household cleaners from entering the aquarium or contacting open water.
Glass vs Acrylic Cleaning Tools
Glass tolerates some rigid scrapers that would scratch acrylic, while acrylic requires softer tools and careful inspection for trapped sand or grit.
Handling Stubborn Algae
Hard green spot algae and deposits may need more deliberate scraping, but pressure should stay controlled around silicone seams and vulnerable acrylic surfaces.
Removing Mineral Deposits Near the Waterline
Mineral crust develops as splash and evaporation leave dissolved solids behind, and it is easier to manage when softened before careful removal.
Protecting Fish, Seals, and Equipment
Avoid striking heaters, cutting silicone seams, trapping fish behind magnetic cleaners, or letting loosened debris clog an intake during cleaning.
How Often Should Aquarium Glass Be Cleaned?
Clean when visibility or buildup warrants it, then address excessive light, nutrients, or maintenance issues if algae returns unusually quickly.
Frequently Asked Questions
Can I Use Household Glass Cleaner on an Aquarium?
Not on the inside, and with care on the outside. Many contain ammonia or chemicals; use plain water or an aquarium-safe cleaner.
How Do I Remove White Crust at the Waterline?
Soften it with a damp cloth or a little vinegar on the outside rim, then wipe off. Keep vinegar out of the water.
Can I Use a Razor Blade on Acrylic?
No. Blades scratch acrylic. Use a soft pad made for acrylic tanks.
How Often Should I Clean the Glass?
As often as algae spoils the view, usually once a week during a water change.