Hammer coral trouble

[mr123]

I've had this hammer since it was a frag and it has always flourished in my tank. Yesterday it looked like this and it has yet to open up like it usually does and I'm wondering what could be wrong. My parameters are checked consistently it is not that all other corals in the tank are doing just fine. Any help would be appreciated solving this riddle.

http://i725.photobucket.com/albums/...A-9559-4969-A73D-54AE45CE1DD2_zpsxvzttjwp.jpg

 

[Rone]

Doesn't look bad in picture. Maybe pooping?

 

[Owen386]

wouldnt worry about it happens time to time looks fine to me monitot im sure hell be back to himself in a day or two

 

[frank180reef]

They close with to much for

If that doesn't work your alk is likely low

 

[frank180reef]

Too much flow

 

[CrypticLifeStyle]

^^^ Thats what i observed with mine whenever they were retracted. My experience with mine seems to point to a moderate flow as ideal, like intermediate wind gusts per say.