In my tank I have a 7 inch male JD, a 6 inch Midas, 4 inch male Green Terror, 2 inch JD, and a 2-2.5 inc convict pair. The convicts are super fast and dont get bothered by my other fish. They are also the ballsiest fish I have (especially the male since he is wild caught). Together they team up and ward off even the Red Devil that almost 3 times their size. I love the fish to death. haha Yesterday I was doing a water change/ tank cleaning and the male convict started attacking my hand. Its crazy the difference between a wild fish and captivity breed fish. I definitely reccomend convicts.