I have a 50 gallon tank with one Pleco and two male Convicts. There are floating and planted plants, both real and fake, as well as several terracotta pots for that homey feel. I've had them for a year and the Convicts are 4 inches each. They challenge each other at times but get along for the most part. They both have scars from the other but nothing serious. I had an Oscar and they killed him, poor old guy was over 10 years old but didn't stand a chance against them.
So can I add two females to the tank or am I asking for trouble. The tank looks so empty with just three fish in it. Also I'm having a hard time finding female Convicts big enough for them.