<a href=showthread.php?s=&postid=11614013#post11614013 target=_blank>Originally posted</a> by sharko88
Yeah, that is the first sign of death coming. Hope it makes it.
I would disagree, only state that it is a symptom of stress for the coral - mine has done that a few times - and while it was obviously stressed, it's done wonderfully now many years later.
I would take this seriously though.
Have you changed lighting, is it new?
IMO, I would say this is likely a reaction to a change of lighting [most likely]. I would be careful not to over-light it, and try to determine the cause.
As with most things in a reef tank, checking chemistry [pH, Alk, Ca, SG, temp, nutrients] is always wise with any tank-problem [if just to rule them out].
If you've increased light on it [changed bulbs, cleared water, moved] - I would consider finding a way to somewhat reduce the light it's getting. I would avoid moving it much or disturbing it .... but would be sure you're not going to slowly bleach it.
IME, bubble corals are sensitive to changes ... but if you take things slow, baby the coral a bit - they are very hardy and can adapt to quite a wide range of circumstances [mine went from low light PC to under 250w MH in my care].
JMO.