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Sometimes a wrasse will focus on spots or markings thinking that they're flatworms or parasites... with typical fish, the harassed fish can just drive the cleaner away with a bit of aggression. Your puffer doesn't have the dexterity or speed to chase the cleaner away.
I'd keep the puffer and trade the wrasse in. Cleaner wrasses have notoriously short lifespans in captivity, but your puffer could be with you for years if it's well cared for.
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