I have a 30 gallon tank that I have about 7 cichlids in and a common pleco. The water is perfect as far as ammonia nitrates and nitrites ph and everything. My fish are fine but the cloudiness is just bothering me. I dis water changes, water clarifier. I didn't change my filter for a bit and when I took it out it was brownish so I replaced it and cleaned the filter part. It's been several days and still don't see any change. Is there something I can do? Any suggestions? Thanks!!