... how do I keep the colony alive and functioning over the winter...
Welcome to Pond Boss Barbara.
I'd like to propose a counter-question in regards to Barbara concern about over wintering.
Could you not create a "zone map" similar to what tree growing enthusiasts have that would show an image of North America with East to West lines that could show a BSF newbie where they could expect various over-wintering challenges? Does that make any sense?
I'm just thinking that most people won't get into something like this if they think that there's going to be a difficult re-start project every spring.
Holding a redear sunfish is like running with scissors.
