So due to size of the Dovii and Aggression,you can never mix a Dovii with any other cichlids,unless the tank was maybe 720 gallons 92x48x36?
I honestly would never mix a dovii with other cichlids at any sized tank, but I could see it happening in that tank I think mels dovii was housed with other fish including two other dovii pairs but one day decided to take over. terd fergusen had a 13 inch dovii in a community with like four other parachromis pairs in a 8x3 tank so it can be done you just have to hope the dovii doesnt snap someday and go on a rampage