"These little filters are fantastic for small tanks. Great for betta tanks, hospital tanks, quarantine tanks, shrimp tanks and baby fish tanks. I like how the flow is adjustable so you won't be stressing out a sick fish or betta with a high water flow.
They're very small and hardly take up any room at all. I modify the filters by cutting a small layer off the sponge on the bottom and I put carbon (pieces larger than the intake slits) in there."
