Definitely looks like aiptasia couple different methods to getting rid of it depending on how much is in the tank there are chemical means, manual removal means, biological means but I've found most effective for me is peppermint shrimp as a general rule they will gobble it up but not all pepper mints will touch it I have 2 in my tank but only one will eat it.
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 My aquarium is nothing but a smorgasbord for my cats.....
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