I'm very new to sps too, but my birdsnest has done the same thing. I'm almost sure it was my fault for not acclimation to new light. I didn't even ask the guy where be had it in his tank, and I did lack flow, but that's not the case now. And 2 mp40w es and a slower acclimation and I think things are turning around. I'm almost positive I burned it, and had less than adequate flow. Best of luck.