I have 8 african cichlids all of which are no bigger than 1.5". I have been feeding them twice a day. I usually use either bloodworms, brine shrimp, flake and pellets. To make a long story short, my Nitrite reading today was 2.0 ppm, which I believe is high. I have a 55 gallon tank which has only been cycling for two weeks now. Is this from overfeeding? I have a penguin 330 bio wheel filter and also an UGF, so I don't think my filtration is a problem. I will do a 60 percent water change and test again, but I welcome any comments that I can get.