Yeah, you have a wide range of possible tank mates. In my expierence with convicts, even large bull males are for the most part easy going if they are kept away from females. Once they pair off, then all bets are off, thats when they will make claims to territory and will be agressive to fish over twice their size.
but when a spawning isnt involved, they will do some chasing and some gill flaring, but they wont do much in the way of damage, even to fish much smaller than themselves.
Hope this helps
-Tyler