Green sunfish seem to vary a lot in aggression. Mine would chase the warmouth I had, but only nudge the black crappie every so often. Greens are great sunfish, but be careful they can be enough to make your aquarium have only one fish. The crappie will be the most peaceful on that list while
your list is greens, bluegill, longear, warmouth, redbreast, redear, Rio Grande Cichlids, black/white crappie, pumpkinseeds, and hybrids.
I would say that the warmouth and crappie are the least aggressive, redear, longear, and maybe pumpkinseeds will be medium on aggression, but can still vary. The bluegills and greens will vary depending on the subspecies and individual. I have 3 coppernose and I would say they are generally beaceful except when the dominate bluegill decides he wants to breed... The readbrest sunfish will kill or be killed. They are super aggressive if they are dominate and will be super sensitive and submissive if it isn't dominate. I would suggest adding the more aggressive fish later so the peaceful species adapt first.
Crappie can be hard to get off live and can be almost impossible to get onto dry foods. I would say this is the case more often with wild sunfish. Get all your sunfish as young as possible. The adults will usually stick to what they know and don't like to change that.
The greens, bluegill, warmouth, , redear, Rio Grande Cichlids, black/white crappie, pumpkinseeds will like a pond setup while redbreast and , longear like more of a river setup with redbreast preferring it the most.
greens and warmouth have large mouths and will eat anything that can fit in there.
When creating the aquarium have 6+ sunfish and as much cover as possible. this will get rid of most aggression. With 3 sunfish, the dominate will give each 50% of his agression. when you have 6, the dominate will give about 20% agression to each...
