Why don't my polyps close?

Drix

Premium Member
Odd question. My polyps on my latest frag never seem to close, that is unless a hermit crab walks across them. I was up at 4am thismorning and hit the tank with a flashlight and was shocked that they were all open and looked happy. Well, except for like 4-5 palys that are white and half open...

Whats the deal? Do they not go to bed?
 
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