FYI my 6-line has only been aggressive towards the cleaner wrasse I had. For whatever reason he hasn't picked on anyone else. On one hand if the lepoard is bigger (and since he has a bit of a different body shape) you might be ok, but on the other hand if your 6-line views him as a weaker opponent he might kill the leopard.
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One more fish should be ok?, right!!!  - Laurie
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