I have a 29g tank with a pair of small full grown convicts. The male is just over 4 inches and the female is around 2.5-3. Do I have room to add any more fish? Also, at the local Petco someone brought in a female blue convict (mine are black convicts) and they are offering it away for adoption saying its a juvenile Jack Dempsey. I've heard that convicts breed so readily that one male and two females isn't such a bad idea. I've also heard that 3 cons in a tank will kill the "odd man out". Does anybody have any definite info to help? Thanks for your time!