Bettas do well in smaller tanks so you dont really need a 5 gallon tank unless you really want to add extra fish. I have had 3 Bettas, my last one I added 2 other fish and the Betta got Ick (also known as Whitespot) likely from the stress of the two fish, or from something with the water. I have a bamboo shoot in my tank, its easy maintenance and looks nice, my current betta likes to swim up against it. Personally I would keep the Betta on its own, my previous 3 did best on their own, the longest lived 4 years. I lost the one to Ick pretty quickly once it got sick. For tank size mine is 2 Gallon and he is perfectly happy there, I have a "bubbler filter" that just makes air bubbles, I dont have a heater or acutal filter system. I change the water and treat the water as required. Good luck!
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