Are there any native fish local to me (around pittsburgh) or that are readily available at LFSs (ex. Pygmy sunfish) that I could successfully house in a 2 gallon unheated tank with filtration of only bacteria and moss for life?
I wouldn't put those fish you mentioned in a 2gal tank. Except the least killie or pygmy killie. Pygmy sunfish is a good choice. I am afraid that its limited options for a native nano tank.not sure what is around u but you might be able to fit some small sticklebacks, or darters, or killifish.