Hammer coral

[jaded]

how long have you had him? Corals will often close up for their own reasons... sometimes for days. I just had a section of my yellow polyps reopen after being closed for weeks... they actually got a layer of cyano on them during their "down time". They are a super bright yellow now :D

[jaded]

no need to shout ;)

If he's only been closed up for a short time I don't know that I'd worry to much, but I'd think with the type of corals that you have that you'd know that they naturally go through "down" times. If you feel that there is a problem then dont let me talk you out of it... can you post a picture?

[jaded]

No problem I was only kidding around!!!

[scuba_steveo]

post a pic if you can and tell us about the tank. size? lights? filters? water parameters?

[Brett Wilson]

Is it in a high flow spot and/or have you changed the flow around recently?
Euphillia's dont like that much flow...