Can the same sex of betas live in the same bowl?

Answer 1

No fish should ever be kept in a "Bowl". The basic rules of keeping fish successfully are. :- 1 inch of fish must have at least 1 gallon of water. ":- Every tank must have a permanently running cycled filter. :- Every tank must have at least 50% of its water replaced every week."

A male Betta is a 3 inch fish and so must have at least 3 gallons of water to do reasonably well. Bettas are tropical fish and so need their water to be kept at around 78F. Female Bettas can be kept together OK in a well planted aquarium. Male Bettas have evolved to kill any other Betta in its environment. That why they have the name "Fighting Fish".