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first of all firefish prefer to be in pairs. Second, he said a firefish and a royal gramma... and no they should be fine. However all fish have different personalities. Sometimes fish that should be fine together fight just because.
My two fire fish are fine together I didn't buy them as a pair but they act like one even more then my clowns and they are a pair. They live in the same hole in one of my rocks and its weird sometimes I feel like there protecting in there cuz on feeding time they take turns coming out to eat it funny