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Originally Posted by chachi  The pond place by our house said we just needed it 18 inches can you believe that and the ones they put in are only that deep. We did ours 3 feet and its still getting too warm and I have a walnut tree by one end of it |
I don't think the pond place you talked to had very good information. A goldfish might be able to survive that, but Koi are 100 times more fussy. I think you should be pretty safe with three feet, we did ours over 4 and I wish we hadn't. Do you have a thermometer? Be sure to measure, at a deeper level, not the surface. We keep one in the skimmer. There are things you can buy and make to make your water cooler.