only one of them hasnt been seen.I just fed the smaller one 4 weened rats and it was catching them out of the air when I threw them in.Im ordering a kane heat mat,13.5x60 to heat the substrate.What would be the best way to heat the ponds?I am thinking that I can use water heater like is used in a house,and it shouldn't get to hot sense I have 266 gallons of water to heat.any ideas would be appreciated.

as for the smaller enclosure idea,I think it will cost more to build a smaller enclosure then it will to heat the one I have.