Hello and welcome! This forum is filled with super friendly people and lots of great resources and advice so you've come to the right place! I recently came back to bettakeeping and am starting up a 5 gallon. I'm excited to hear about your new tank journey! I agree with others, if you have the space for it, a 10 gallon will be easier to maintain. If I had more space, I probably would have leaned towards a 10 this time around but instead will be setting up a 5!
Be sure to check out the sticky threads under the various categories on here, they have a LOT of great info on setting up tanks! Once again, welcome!
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<3 SIP King, Sir Arthur, and Mr. Fish <3