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It's my understanding they don't really reproduce much in an aquarium - so physical removal should work.I have another pretty large colony of zoas that are on a old mussel shell that only half have been opening. I decided to pull it and do a peroxide and iodine dip. Low and behold 3 more keyhole limpets fell off. Not even sure where they were in the colony. These guys have all been small so far. I’m guessing I will be dealing with them for s while again.