Anybody want Xenia elongata?
Probably the Alk level like I mentioned in the above post. Check your Alk, and see if it's low. It should read between 3-5 Meg/L(10-15 dKH)
If it's below this, add some buffer to your tank to slowly raise it over a couple day period. Also check your pH as well, as raising the Alk often causes the pH to shift. You might find if your Alk is low, your pH is too high anyway. Raising your Alk level should cause your pH to fall and stabilize.
Just my best guess...
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