I have a purple and a sailfin and there's no problems. The sailfin is a model citizen and never fights with anyone. I don't know if the same would hold true in a 75...the sailfins get pretty big quickly. Trick is make sure the sailfin is added first. Hippo may be your issue, since it's already established.
I also have a Sailfin and Purple Tang. The sailfin is much larger, and is the dominant tang. The Purple Tang has learned to sneak a bite off the seaweed clip. The tank is a 150 gal., so i'm sure that helps keep the confrontations down.
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