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I'd love a clearer picture to be positive. But it just looks like an algae.
I'd pull it out and clean it. Either in revive or a light hydrogen peroxide.
Peroxide IME however is kinda harsh, and if the zoa is already not in good health it could make it worse.
So honestly you could just clean it in thank water if you don't have revive or a coral cleaner.
A coral dip. It's kills bugs but also kills algaes and helps with infections as well.What's revive?

