ok ive tried sps many times now and when I get them they are fine for a few days and bam they turn white. I have a green montipora and is doing fine. all of my parameters are stable the only slight problem I have is that my nitrates are at 40ppm im going to check it tomorrow and I do a 15 gallon water change every week. well I went to a frag swap two weeks ago and I got some sps frags. I got a strawberry shortcake, tyree poker star, and a few others well everything that I have kept at the bottom of my tank stall has color but one. and my poker star started to bleach so I moved it up a little and it looked better but now not so much. I also moved another sps frag towards the top. it had color when I moved it but now its a little white. I don't know if its my lights or not. or something else. its a 55 gallon tank and I have a t5 metal halide combo. It has 4 t5 bulbs and two metal halide bulbs. I have about 5-6 Inches above my tank. 2x Odyssea 250W DE HQI Bulb 15000K and 4x Odyssea 54W T5 High Output Bulb Actinic Blue. any help or tip would be fantastic I also have a frogspawn and hammer coral that are doing fantastic and I got an acan that looks great