Zoas "melting"

[Octoberfest]

I have numerous zoa frags in my tank and they're all looking healthy except for one frag. Over the past couple of weeks I had noticed that about 80% of the zoas had closed up but the other 20% were opening fine. Those zoas have not opened again and it appears as though the closed polyps were starting to shrink in both height and diameter. Finally a few of them had turned brown and I put them in some direct flow to get off what I thought algae but turns out was just a dead zoa and it blow a few off which just disintegrated. The ones that I said were still opening are still opening today and look fine.

I have many other corals in my tank and everything is doing great.

Does this sound like it could be a disease or something else? I'm trying to figure out if I need to treat the other guys with anything else to prevent something from spreading.

 

[Fishindude88]

I have had this happen and all the other zoas that were not attached were fine. If the attached zoas start to do the same, separate them from non-infected zoas and they will probably be okay.