I realize this thread is a few months old, but because I'm new here, going back is interesting.
These are some of my favorite Madagascans, having kept them about 10 years ago and just recently acquiring some again. I find them most lethal with each other at a young age and under 4 or 5", once past this, its a lot of bluff but not so deadly in 6 ft tanks or larger. I have a quartet of adults in a 6 ft tank with 5 Paretroplus maculatus, half dozen Herichthys bocourti and a lone Herichthys bartoni, the busyness of the tank seems to male Paratilapia from doing in the 3 smaller females.
i have found species such as Herichthys carpintus to be a bit too aggressive to house with Paratilapia


I also started a growout tank with Paratilapia sp andapa, etroplus canarensus and Ptychochromis sp tarantsy.
Most of the Etroplus and Ptychos are still around but the largest Paratilapia seems to have eliminated 7 brothers and sisters, while ignoring the other species.
