go with a heat pad around a third of the size of the tub. i'd use an accurite or similiar digital thermometer to keep any eye on the temps. you could use a larger heat pad but i would strongly recommend a thermostat if you use a heat pad any larger than a third of the tub. if you choose to use a second pad you will have ot have a second rheostat for that one, if you add up the cost of 2 pads and 2 rheostats, you might be better off with one large pad a and one thermostat.


vaughn