but be careful, as 35% Food-grade Hydrogen Peroxide can actually burn your skin. If you're worried (or can't find the Hprox/rubber gloves), try 0xy-Cle4n, and scrub the shite outta the tubs and whatnot.

You might want to replace your airstones, if you use 'em, or try adding airstones to your resevoir(s) and a whack o' air to help prevent scum/algae. And try replacing your hydroton with new stuff, or black aquarium gravel (have a friend who is using it with much success).

Just a thot