It's a type of a "hellfire" anemone..... They have many varieties and looks. Basically small anemone that can multiply fast and move around the tank.... They do sting things as you can see your Zoas are closing off next to them...
I would just keep and eye on them if they start multiplying might want to try and get them out.
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Justin
Current Tank Info: 25G cube (finally back in the hobby in a small way)
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