HELP please with my zoas

Becca2020

Reefing newb
I have had these zoas about a month now n I just noticed that there was something going on them. I took a tooth brush n slightly brushed on them to see if I could get it off but when I touched it it shrunk up so I couldn't get it off. If anyone has any idea on how to get it off and what it might be please let me know I would greatly appreciate it. Thanks everyone
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