Just looking for some feedback or tips here. I've kept fish for well over 20 years, but never an unheated tank, so there's a lot of second guessing going on. The plan is for a 75gallon unheated tank with gymnogeo balzanii or labiatus. Other community fish would include salt & pepper cories, serpae tetra & wild type swordtails if they can handle the temps(these seem to be the most common recommend fish to keep with gymnos from the articles I've read.) I'm guessing my temp range will be 68 in winter & up to 76 in summer. Does this sound ok? Anybody see any issues with the community fish not handling the temps? In the lower water temps do I feed the fish as usual or do their metabolisms slow down & I feed less?