You're more than right. I didn't realize that. Garage is the only option though. I just ran to petco and grabbed a heater. Hope it does the trick! Thanks!I think having it the garage is a big mistake. You want stability and there will be far too much of a temp swing from day to night. I'm in Florida as well. We have a big cold front coming through. Miami is going to be in the 40s this weekend. That will guarantee a dead anemone.
The heater may not able to bring the temperature up from 40 degree. Consider bring him in to the table, even if it is just for one or two nights.