Ok, so i got a ora green stylophora because i was told that it grows quickly and is a relatively hardy sps. The color is nice but over the past month and a half it has slowly been loosing tissue. I have other sps that are doing great. It is under 150w metal halide and it is only about 6 inches down from the top. flow is not a problem because it is right in front of a moded maxi jet with about 1500 gph, my nitrates and phosphates are zero, calcium is 500, and everything else is dong great. It has barely grown since i got it and i just want it to do good. Any help would be greatly appreciated.