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You'd want to sterilize it, clean it out with hot water and vinegar. Dry it well and rinse with hot water, dry it again and use extra water conditioner when filling it up.
I would recommend putting your new guy in the 10g tank and doing daily water changes with all water being treated with Prime. Either way he'll be in cycling water, but with a heated and filtered tank, the Prime and the water changes he'll be much better off in the 10g. He'll be happier and the 78-80F water will make it much less likely for him to catch Ich.
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