Can you keep female betta with male betta?

that would not be the best thing but all Bettas are different. a male betta is used to being alone. if you would like to do that, keep the tank in shallow water, about the depth of half your tank (about your finger height) and make sure they have a lot of room

ideally a male betta should never be kept with any female bettas unless they are breeding as they 'supposedly' will attack and kill each other. However i have a male betta who has lived with 3 female bettas for 8 months and ive had no problems. he never flares at them, has never attacked them and vice versa. he will even sleep next to the smallest female.