With my old dat I actually had to use a semi-aggressive fish (an oscar to be exact) to break off the dat's aggression toward the other fish. When I just tried using silver dollars, he beat the hell out of them too. Only when I added the oscar did the aggression towards the other fish stop.Sounds like a mean dat. If you can't separate them then try getting some dither fish, like silver dollars. Just any large hardy peaceful fish that will help spread the dats aggression
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