My tank is 180l, I've got 4 catfish, 2 silver dollars, 3 angles, 3 gouramies, and 8 small fish(don't know their names yet! black tetras?)....I change the water every week, but feed them every day, I rinse the filter material 1-2 weeks....But I got a new log when I started my tank...maybe this is part of the problem? I so want a cristle clear tankhealthy water should look nice and clean, when was your last water change, when do you do your water changes, how big is your tank, and what fish do you have in it?
Only rinse the filter in old tank water or dechlorinated water and do it each time you do a water change. If you rinse them under the tap, the chlorine can kill your bacteria.I rinse the filter material 1-2 weeks