I've had sucess with yoyo loaches as tankmates. They clean up after meals, and they seem to keep my JD not shy or skittish due to how active the loaches are. Other tankmates I'd consider would be any kind of dither fish. JD's can get really territorial when kept in medium sized tanks 55-100gal. If you have a bigger tank you could perhaps get other cichlids that would hold their ground to a male JD. Green Terror, Sal, Cons...
Also keeping caves pots and hiding spots all these are territories which will kept aggression sometimes in check :thumb:
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