Well, if the GSF get pushed out you can still manage for nice BG. I would untimatly be happy with a healthy population of any sunfish.
Some good news, my neighbor who has a little pond upstream from my proposed GSF pond is interested in experimenting with GSF. His little pond is in bad shape and might have experienced a fish kill. He has bigger ponds also, and the idea of a small GSF pond that his grandkids would enjoy sounded good to him. I'm going over there today to take some photos and measurements.
Also for more GSF - LMB comparisons; if GSF have enough room they don't spawn in groups.
