I think my older 5.5" fish is a female. The other 2 are under 2" so probably impossible to visually sex, but they are not at war so maybe that is a good sign that it may be 1 each. You can see the damage the bichir did to the fish's tail, it was not out of aggression but most likely just seemed like something to eat to the bichir in the dark. I have seen pollinis growth rate compared to that of a bonsai tree by others so you would definitely want to take purchase size into consideration. I think
duanes
had a colony of adults so maybe he can add some expertise here. Except for the growth rate, I would say they are very oscar like in personality and temperament.