I agree... have you checked him for any type of outlet? Poor Sparky. Being the kid in the garage kind of sucks, how are plans to move Sparkster indoors coming along? You could put him in your kitchen. . . he'd fit right in! Potatoes, sausages, Sparky. . .
Do you keep the tank covered at all? I have a tank in my basement, which isn't heated at all. I have the tank covered on three sides at all times with a fleece blanket, and an insulated blanket thing on top. Overnight, I cover the whole thing with the insulated blanket. It's really helped keep temps stable in there, but my basement probably doesn't get quite as chilly as your garage. . .
HUZZAH for snails, lol. I'm guessing the pearly gene didn't come through to the lil' guys? Bummer...