It isn't recommended. However, recognizing that you may go ahead and do it, I would suggest you have at the least a large critter carrier on hand. Use it for feeding, or possibly use it inside the larger tank to temp house the new one. Not a very good solution, but better than pure cohabitation.
now, my conscious needs me to point out...
canabilization, risk of spreading disease due to a lack of quarantine, undue stress on both animals, the stress on you.
good luck with whatever you choose, and perhaps ask whomever has the animal you would buy if they would hold it a week or so once it's paid for. Most breeders would rather that,than have them cohabiting.
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