I am new at this, I got the tank at Christmas time. New. I have ruby barbs and banana barb fish. The filter I have is like a white fuzzy bag that you put charcoal inside and it is working...at least it is spilling the water out and recycling it...other than that I don't use any nitrates?? In fact I am so new at this I wasn't aware that I had to put other things in the water and test for ammonia etc. I guess I should get to a fish store and find out what I need. I have bubbles from an airator and the filter, that is it......is that wrong? When I put new water in I add the aqua safe drops but the water clouds up a lot.....do I need other things in the water to prevent this.....sorry I sound so stupid but this is all new to me....no one in the fish store told me about checking nitrates or stuff like that. I have two little boys that wanted a fish tank and I thought that I had everything......thanks for responding though....let me know if this helps at all. All your help is appreciated....since I am a beginner!!!