I agree optix. I'm tired of the theme in general. Everyone takes it as a personal attack. I wish they understood that the only reason I know that tank is overstocked....is because I learned from my mistake. And then you have those like DBCB who just don't care and then flaunt the death of their fish to annoy people. Now thats pretty cool.
Anyway, (now that the rant is over), your tank is horribly overstocked. The Blue cat will get up to two and a half feet alone not to mention the other cat that will get over a foot. Oscar over a foot, eartheater will be killed soon by one of the convicts, Dempsey will take to hiding and probably get in a tussle with one of the Africans, if they don't die from the stress of the wrong water parameters first. And the jewel cichlid is a killing waiting to happen. Oh yeah and I wouldn't pick any of the fish on your poll accept the red devil or convict, the only truly aggresive and not simply territorial fish. Now that the flogging is done we all mean it for the good of the fish and not to be mean.
The difference between a male and female con that is easiest to distinguish is the female will have an orange belly. If you really want to breed them I would get rid of all of your other fish. You could add some schooling fish like silver dollars, a clown or galaxy pleco for algae detail, and maybe a raphael or talking catfish for scavenger patrol, they might eat the fry though. I hope you take all of this with a grain of salt and realize that we are not being malicious.