75g reef tank, 2- 175w 10'000k metal Halides, 2- 40w 48" actinics,wet dry filter driven by mag 5 with 9w uv in return line, 3- aquaclear 402 powerheads in tank 270 gph each. Nitrates-0/ PH 8.3 to 8.4 /Cal. 400ppm/ Alk 3.8 -4.5. Tank is on rebound from long neglect but is doing very well. Just wondering why this coral is not opening have other softies in the tank nothing aggresive by any means. The thing opened up the first hour in the tank and now has been closed. I know leathers can sometimes close for days but mine don't.I do have it mid to upper level of the tank maybe I will move it lower in a day or two if it doesn't open. That is why I was trying to ID. Thanks if I missed any info that might help let me know.