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any old powerhead or submersible type impeller pump, rios are cheap and powerful, penguins are good. The powerhead itself will provide some heat but ya might have to drop in a submersible heater and floating thermometer to keep it where you want.
since powerheads are epoxy sealed you can just whip one in there anywhere and not worry about it. Youcan get one for $15 for smaller ones or even cheaper yet.