You'll probably get more help with a more specific question.
Do you want to heat water, either for your fish or for heating the ambient air?
Do you want to heat air? (I'd say don't, refer to prior option.)
Do you want to generate electricity for your pumps?
Can you get even more specific than that?
What exactly is the problem you're trying to solve?
I did NOT cry! It was this tiny ad that cried. The tiny ad is a crier, not me.
It's like being on a deserted island - only with gardens and natural buildings in Montana
