Does anyone have any pictures of what the beneficial bacteria should look like on your biomedia? because I am pretty sure it should'nt look like what I got. My biomedia has long "Moss Like" "Grime Like" crap on it. It almost looks like a dark muddy substance. I am not sure if this is good or bad? And the substance is only on top of the biomedia (like the top 25% of the biomedia) and not fully submerged with this stuff. I do 25% water changes every week. The only thing I got in my tank now is about 2 feet of driftwood and, Three 4-1/2inch RBP's, a pleco, and a couple giant danios. My filters are and Aquatech 30-60 (kinda like a penguin with no bio wheels) and a Whisper 30-60, I know my filters are not that great but they should do the job. Its a 55 gallon. I got my water tested a week ago, and i had a tad bit high ammonia, and the lady at the LFS said I had low either nitrates or nitrites, not sure which one it was but she said that it was low because I did not have enough beneficial bacteria in my tank. My ph was low because of the wood so that is good. If anyone has any pictures of what there beneficial bacteria looks like on the biomedia, post them, because I seriously think something looks wrong with mine.