My 5000 gallon above ground pond has lost 10 inches of water in less than 1 week. No visible leaks, waterfall, 2 filters and aerators are all intact. We took all 30 koi fish out and put them in 3 - 25gallon storage tubs until we can get something larger to put them in. We have plans to just keep them in the garage this winter. What do you think the cause of the water lost is and what can I put my fish in for the winter?
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