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Then put an air pump/sponge filter or a small filter on it. I just would not put it in your tropical tank. It won't do well, it may cause your tank to go into a mini cycle (depending on size) and it's very likely to spread disease.
Ultimately you are either looking at setting up a bigger tank for it or taking it to a fish store (preferably not Walmart). It can't stay in 10g forever.