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Very strange. I only have clown fish and the zoa as the only other inhabitant. I run a wee bit of carbon in case of the zoa but other than that everything is fine. Frustrating.nah its on its way out...
When its that bent over and shriveld its burning itself and will melt away.
I have not been able to save any of them once they get that way.
You tank probably had a something die, or something bad get in its water column.
But yeah sorry OP, if it bounces back, consider yourself very lucky...
What i did in hopes to save mine, which i failed, was i trimed what look like a healthy section of it, and put it in a rubble pile hoping it would grow out again.
But, the uncut portion melted in a week, and the trimmed portion never took foot hold so it died as well.
Very strange. I only have clown fish and the zoa as the only other inhabitant. I run a wee bit of carbon in case of the zoa but other than that everything is fine. Frustrating.
I have two 16HD’s.Is that an AI Prime light? Just one? I just checked your other posts and this is on a 90 gallon tank? If you have only one on a 90 gallon then unfortunately its not enough light, it would explain why its melting. The zoa's are also having some sort of issue.

I would suggest to rent a par meter from your LFS that way you can know for sure. They are not very strong lights and I feel you have the setting a bit low. Personally I would want more watts but it’s really just guesswork a par meter gives you an actual number to work with that way you know if you need more or less. Good luck
My cespitularia is growing crazy and my xenia all just melted. No idea why. All other corals are popping, everything from plate corals and months to leathers are doing great. I like the pumping of the xenia- too bad.I have a Cespitularia that was doing well but it just stopped expanding. Most other corals are doing great and grow well, zoas, mushrooms, toadstools, Capnella, Monticap. Only the Xenia is growing slowly and this one shrinks. These two should be easy but not in my tank.