First, agnowlege the size of your tank/ aquarium. Bettas need at least 5 gallons. Second, keep it odd. You need to have an odd number of bettas sot they can split any agresion they have. It's fesable with two but dont test the waters. (No pun intendid) Third, make it lush. If a betta gets stressed, it's gonna want somewhere to be alone. Wether it hardscape, plantscape, artificial decor, corner of a tank or even a little cave, they are gonna need somewhere to be when they are stressed.
