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That is the dreaded bubble algae. Get rid of it completely. I would take the rock out before it spreads any further.
I've been dealing with this stuff for 2 years. You don't want it to spread.
Popping them releases spores that create more.
That is definitely aiptasia. Sorry.Also, please tell me this is just a dead zoa and not aptasia
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. If you can take the rock, or sand out and scrape them off. I had great success with green emerald crabs. They cleaned a heavily covered tank with them. It is hit or miss.Ok one problem solved. Just scrapped that little sucker off and down the drainThat is definitely aiptasia. Sorry.

