Star polyps question

[Raysxb]

I have had a colony of green star polyps for about two months now. It would come out daily. I have them in a 50 gallon with 500 watts of 14k metal halide lighting, overflow with wet/dry, protein skimmer, running rodi water. All perimeters are where they need be. All of my other corals are doing well.

For the last few days, it has not come out at all. I am just at a loss for ideas. I haven't done anything new. Any suggestions? I am relatively unfamiliar with this type of coral.

Any words of advice would be appreciated. Thanks

 

[Hinds04]

Mine do this every once in awhile as well.

 

[Ricksreef]

Same here,anytime to move them and even sometimes doing a PWC will cause them to close up awhile.Give them time.