I'd never do that, I'd spend the whole Winter worrying about him. I have him in his little tub with a light on top. It gets as low as 14-20F here, there was a fire in our neighbors apt and the insulation was never replaced, so keeping the house warm is getting hard this year. i'll just keep him in his little tank for now and maybe throughout the winter.
You think he'll be okay in his 6qt tub until feb? Should I drill larger holes in it or keep it closed up?