I would definitely recommend bringing them inside if it's going to get cold, I don't think they can live if the temps drop below 60 in the tank...mine eat crickets and meal worms, but others will feed cut up nightcrawlers too. I might be wrong on this but wax worms have a hard "shell" on them that can cause a blockage, at least in pacman frogs. I think wax worms are okay every once in a while but I wouldn't make them a staple, I would suggest crickets for that.