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I agree.. a 2.5 gallon won't cycle as the surface area is too small. You can keep live plants in a 2.5 gallon, but wouldn't have to go through the whole cycle process. Just make sure to QT the plants for a week or so before you add any fish in with them as sometimes they carry snails, etc and you want to make sure you have only what you want in the tank with the betta.
Good luck and can't wait to see some pictures of the set up
Good luck and can't wait to see some pictures of the set up