I am having the same problem with my acans. I have a 31 gallon with 2 white t-5 2 actinic t-5 all 31 watts. I was told to raise my acans higher into the tank that way they show off a little more color. They were also puffing up a lot, an indication of lack of sun light. Move them up a little to bit to see if any color comes back(but not too much). I know that under my LEDs they glow very nicely, but under my T-5's they are just normal.