I run 20s and 40s. I'd rather a 100lb, but don't have a place for it. The nice thing about a bigger tank is, it won't freeze up as fast and you can usually draw out every little bit in the bigger tanks. I hate freeze ups. If they do freeze, grab a bin or muck bucket, put the tank in it, fill it with water and strap it down. It won't freeze that way. They will float so you have to strap them down. Water doesn't have to be hot either. Straight from the hose works fine