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Look up hair algae It may be an nuisance algae, based off of description your picture is not the easiest to view. Various causes such as light and water conditions.
Is that it looks like?
If s ho many hours do you run our light and how often are you doing waterchanges how many gallons per change etc...
Is tank new or old setup?
How many gallons is your tank?
So is it the hair algae?
Take some hydrogen peroxide mix about 1 parts peroxide to 3 parts water, dip for 4 minutes, rinse in clean saltwater, put them back in tank. Make sure they are closed up before you dip them also. I have done this numerous times with no ill affects.
Is it only on that zoa frag or all over he tank sorry for all the messages.
But yes a good close pic will help identify and anyone who has had it before if not a type of nuisance algae can describe their experience.
I got a rock from petco that went through mt tank cycle has some green buttons on it that remained closed for 3 months. Then they opened up and started spreading. I have never seen that mixture melt zoas or palys. I also had about 48-40 different types of them.wow. Thanks. I will try this. Hey one more question. At what point would i know the zoanthids are unrecoverable from melting?

