Ok I have a 40 breeder and my lighting fixture is 2 MH 150 watt each and 39 watt T-5's. When I had the MH running I saw that my candycanes and orange digita fading out, but then my pink birdnest growning really nicely. I had the t-5's running for 7 hours a day and the MH for 4 hours a day. Now I completely took away the MH and i am just running the T5's for 8 hours a day and my zoas are not really growing as they were before. Do you think the lighting fixture is too powerful for my size tank? thanks.