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One shell should be fine. You could actually get away with just feeding him before you leave and just let him ride the 10 days out. Fish can survive a good week or more without food. After all, in the wild food can sometimes be scarce, and they will go periods of a couple weeks between eating.
Just to be on the safe side though leave one. I would agree on not leaving two for the reason of decomposition dirtying your water and poisoning him with ammonia buildup before you can return.
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