heaters

Up for sale is a very cool 46g bow front aquarium. Tank is glass, and is in great shape - does not leak and there are no major scratches or blemishes - just normal wear for a used aquarium. The stand is hardwood and very strong. The glass lid has a crack in it, but is held together securely by...

Have these heaters still in the box unopened 500w 40$ for all four.

So I'm just finishing up a build for my ID sharks, 600gal plywood tank- 8x4x3 inner dimensions. I live in Minnesota and it will be set up in a heated garage, kept at about 70F during cold months, and insulated against heat in summer. My question is what kind of heaters would y'all recommend...