I have a ten gallon (with about 7 or 8 gallons of water) tank with one taricha granulosa and three ghost shrimp (meant as snacks, but have become friends/playmates). I have a Whisper 10i filter, and no bubble stone. One some of the wide-leaved plants there seems to be "dirt" piling up. I don't have a camera or I'd send photos along. I use stress coat, stress zyme, leaf zone, and sometimes a ph regulator by jungle. Any ideas? I just cleaned the tank a few days ago BECAUSE I saw this "dirt", but it's back already!