The tackle shop I work at keeps them alive in a 60 gallon tank type thing with about a foot and half of water. We use two airarators hooked up to two of those aquarium stone things. We keep like 80 eels in there with no problems. I don't think you will have to worry about the water temps, especially if they are kept outside. Make sure you put a top over the tank if not they will find a way to get out.
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