I’ve already solved the problem but wanted to throw it out there for anyone who may have this issue.
Zoa in tank a month with zero issues then suddenly closed up for past few days... found this star on one of the polyps. If it wasent eating it, it was sure aggravating it.
I have some in my tank as well, but have not observed any negative action. I have heard they can be destructive though. Thanks for sharing this. I may pull them when I can just to be safe.