10 gallon per inch is the rule I've heard. But I'll admit that I don't know that much about turtles, I did study up quite a bit after I agreed on taking care of this girl over summer so I could properly take care of her and that is what I'm basing my opinions on, but maybe I'm wrong and they can live just fine in smaller tanks as well. It might be worth asking some more experienced turtle owner about it.
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