From my experience I think male convicts can cope with other aggressive cichlids sometimes and specially at breeding time they might even chase bigger ones away. But females along wouldn't have a chance to survive among aggressive cichlids. Longtime before my old jaguar killed a 5" male convict and the oscars and others that i'm having now had killed a my female convict recently who had managed to go through the divider. Anyway I had kept convicts even with carps without any probs.
Btw how big neets would grow?
Also might add.... it would be a great talking point having this huge monster fish (a Dovii) sharing with the baddest little cichlids (Neets). They also happen to live together in the wild believe it or not.
Anyone whos owned Neets would think differently.
If you provide adequate hiding places and cover Neets will survive.... I used to keep them with a huge Red Devil and for a time a Large pair of Festae. The Dovii would hardly notice the Neets let alone conside them a threat to his terrotory
If you provide the Neets with little caves and clefts that the huge jaws of the Dovii won't reach they'll be fine. I know its not the safest existance for the little fish but Neets are very prolific aswell so 6 will soon become 50.... Then the Dovii will have a nice natural resource of live food if he can catch the little buggers.