Well i had quite a bit of structure to begin with. The aggression was not like overly dangerous. It was just stressful to watch the constant chasing and the obvious stress of the smaller ones.
Figured so which is why I mentioned the above, unless you found a relaxed one. I was watching my 3 fight each other last night over a bunch of different areas. They don't hurt one another as of yet. Green Sunfish with others in a small tank just doesn't work every time, or most of the time.