To have a community cichlid tank and have no fighting is darn near impossible. They are cichlids, they're going to fight and biker among themselves at least a little. Not a big deal. Its when fish start to show up very baddly beaten or dead that it becomes a serious problem, and sometimes by then, its too late to take much action. Its best to know the species you are getting to know what you are getting into before you even populate the tank.
As for population control, some fish like the julies are very good fry theives and can help to some degree. You can also intervine yourself and manualy remove the fry to what ever you want to do with them.
A species tank is also an option. But being your first venture into Tanganyikan cichlids, you may quickly find yourself wanting more, and more and end up with more and more tanks to keep them in. (not that I speak from experence on this or anything )
As for population control, some fish like the julies are very good fry theives and can help to some degree. You can also intervine yourself and manualy remove the fry to what ever you want to do with them.
A species tank is also an option. But being your first venture into Tanganyikan cichlids, you may quickly find yourself wanting more, and more and end up with more and more tanks to keep them in. (not that I speak from experence on this or anything )