For a 10gal, I'd stick to dwarf species of cichlids, rams, kribs, apistos are just a few. Matt I know has bred convicts in a 10gal before, but I strongly dont suggest keeping them in there for life. Male convicts reach about 6" and females around 4-5" there would simply be not enough room in the tank for both fish.
Just stick to smaller species, and if you want convicts, plan to upgrade in the near future.