I've had this tank for about 2 weeks now. I have a penguin 100&150 running at the same time. (I know over kill but it's clear as hell) I have a bunch of mollies, few tetras, and a pleco and a ghost knife. The levels are all good (i think.. I jump stated the cycle then started to use the special blend) . Clear water. But some of the tetras are losing color, but are swimming fine. And my Molly is getting gold coloration all over. What's up?