Zoas won't reopen

[IotaElwyn]

So let me preface this at this time I do not have my parameters, I can gather those later if we feel that's an issue. But about a week ago, a hermit crab took to liking where I had a colony of Zoas placed. As they tend to do, he walked all over one my colonies. Since then, they will not reopen. Other colonies of Zoas in my tank are fine, just this one I cannot get to reopen. Anything I should be checking as to why they remain closed?

 

[Tahoe61]

You should take the colony out and dip it in Lugols or Furan and see what shakes off.