
Well.....that's what I call it.
Yeah the sponge does get cruddy pretty fast, but I also do a couple water changes eack week on my snail tanks. They are poo factories aren't they!?! Twice a week I do a quick gravel vac, and rinse out that sponge, then every weekend I take the critters out and wipe down the walls, plants etc. and clean it up good. Snail snot everywhere!

But in the bigger tank I have 2 dwarf frogs too, so the sponge also helps protect their little feet.
Jeana that is a nifty contraption on your intake....how did you do that?