I have had numerous Red Devils and Green Terrors and though some Terrors can be aggressive the most are pussies. Red Devils are extremely aggressive but of the two Dovii I have had, both outgrew and dominated the Red Devil in the same tank. My vote is with the Dovii.
P.S. In general the Jack Dempsey is in another league and should probably be kept with goldfish and guppies and other worthless whimps.
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