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This what I’m using right now. It is mainly for plants until we get the pond re-dug, but I put half a dozen or so goldfish in there to give the plants some fertilizer. It works well, as long as nothing punctures the inflatable ring! Not sure of the volume, but it holds every bit as much water as my 300 gal stock tank. It’s in full sun and the stock tank is in mostly shade. There is a big difference in water temperatures between the 2, and they are roughly the same depth. I bought a new water lily that I hope will add some decent shade. If this entex pool was a small kiddie pool (say, 14” deep), the fish would be fried by now, due to the exposure.