I have 2 plecos in my 10 gal. tank (with 4 platies and 3 neon tetras). The plecos clean nicly, but make also the most waste so that my waterstats are not good right now, even though I do a 25-50 % waterchange with gravel vacc. ervery 4 days. So I think the plecos have to move out - but what else could I put in, that helps to keep the tank clean and doesn't produce to much waste?