Help! What's going on with my Zoa's?

[RockYourRedSox]

So for the last week and a half or so, my Zoa's are closing and appear to be almost melting. The weird thing is that some of them will randomly open and then close now and then. It's not affecting the other Zoa's in my tank, just the one colony. Any info would be appreciated! Thanks in advance!

 

[jimmer]

Something nearby that could be stinging them?
Change in flow?

 

[Williard_Karen]

Do you see any of these in your tank?

 

[Vincent73]

Digitate hydroids? I have these too, I usually try and remove these if I can. I haven't seen any real way to get rid of these. If all parameters are good, I would probably give them a dip.

 

[Williard_Karen]

I have them in my 20g frag tank... I just use superglue (courtesy of twilliard who is my dad) it seems to help as we do not want to risk the snails to fendbendazole... :/