My 120 G has allot of tiny debris in the water. It is not cloudy and I am still doing 25% water changes every few days as of it's initial setup just over a couple of weeks ago. I have a Fluval FX5 connected to the bulkheads behind a corner overflow that only strains in from the top. The return is dual nozzle pointed generally the same direction but slightly different, towards the other side of the tank. I have prefilter in the top basket, course then fine foam stuff in the middle, and fine foam then bio media in the bottom. I don't know if it's because of the way the filtration is set up or because I have four insane yoyo loaches that continually mess with the substrate, or if its because of algae or what... allot of the debris I am seeing looks like very fine hairs about a 1/4 inch long floating around in the water. Or is it normal to not have perfectly clear water?