This large centerpiece coral has been nothing but healthy and hardy the entire time I have kept it. I don't do much special for it except provide it with proper lighting and current (it tends to prefer good current and lives in a "whirlpool" area in between 3 powerheads and the return from the sump). It does seem to open and close unpredictably, but has overall not given me any problems, even through some of the upheavel my tanks have undergone with other problems.