Just a heads up most all sunfish are super dirty, you're going to have to put a bad *** filter in that. I tried this before with a pumpkin seed and a couple of other sunfish and they were just too dirty for me.
I used to have some sunfish, they can be VERY aggressive. I once had a pumpkinseed that killed off everything else in it's tank before it finally died when my day (for reasons still unknown) decided to turn off the filter, which killed it.
We aren't going to try it anymore, my friend wants me to do most of the work for the tank and I REALLY don't care that much... When my JD gets a new tank I may try doing natives in a 55, but for now it's a no-go.