Zoa Disease?

[Anthony Kochevar]

I bought a large colony of zoas the other day. The colony looked health but the past couple of weeks more and more have refused to open and some are wasting away with what looks like cyano on them. I don't have cyano in the rest of the tank. Worried that a few more weeks I'll loose the colony. Any ideas?

 

[Robert_ellis]

Water parameters, flow level, light amount... all things needed to give an honest opinion.

 

[Ben little79]

Hello.. The zoas i have grow this crust time to time.. I gently scrub it sometimes.. It will come off.. Some times you get lucky and a pipette will knock it loose.. Hope that helps.. Good luck..