So far the only success I have had is my current stock with a 4-5ish inch male bleekeri and a 2-3 inch male polleni in a six foot 125. They tend to stay in opposite sides of the tank. What's odd is I have another male the same size and both the Bleekeri and Polleni terrorized the heck out of him, so he is out in a pond. No clue why these two are fine with each other, and both hated the other male. My guess would be, for now the two territories are suitable for the two and the other male could not seek his own. The two little Polleni killed a female already, I should've acted sooner for her. I have never had long term success housing 2 or more paratilapia together, although this has been working for a month or so, I am waiting for the day it goes south.