Thank you for the advise. I have a 40 breeder I want to put a pair of apisto. Ortega’s and pair of Cacatuoides together on either side with plenty of caves and areas for them to hide and take over. Is it feasible??Depends on the species and if they are different species or same species. Generally speaking none but people have raised colonies of the same species over time (which is a little different than introducing as a group); also many species of apistogramma are harem breeders which makes the question a bit dubious.