Acanthophyllia at night

[Dumzy]

My acantho seems to be closing up super tight at night and is piercing its flesh with its skeleton. Sometimes it looks fine with its feeder tentacles out and sometimes it looks super bad. It looks great during the day so im not sure what could be going on for it to do that only at night. Is it just a normal thing they do? Its been in the tank for about a month.

I don't have any known coral nippers in the tank, besides an emerald crab.

Parameters:
Salinity 1.026
Temp 78
8.0 DKH
439 Calcium
1300 Magnesium
10 Nitrate
0.01 Phosphate

 

[KrisReef]

Are you feeding it with anything? Mine likes chopped clams and always looks better after a meal.

 

[Dumzy]

I spot feed it with some frozen food a few times a week when i feed the fish, and sometimes reef roids. But yeah ill definitely try giving it something more meaty.