Zoas not opening

[daniel90]

Hi all, attached is a photo of my zoas.
I’ve had these about 3 months and they grew from 1 to 4 polyps rather quickly, and have now been closed for about a week. All my other zoas are flourishing. They have some kind of algae looking stuff that forms next to it that I try to blow off with my feeder. Any ideas what I can try doing?

 

[blaxsun]

Sometimes zoas will just get ticked for whatever reason. I'd probably just wait and see if they open back on their own. I had a really large colony that closed up for the better part of a month but they eventually reemerged.