I have a pair of clarkii clowns and a coral beauty. I have never had percs so I have no basis for comparison, but I don't find that they are aggressive towards my coral beauty. They can be slightly aggressive with each other, nothing serious, but that is the behavior amongst clown breeds. I guess everyone has their own experiences with each fish. But I am very happy with my selection of the clarkii's. They have a lot of character.
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