I know that this is an old thread, but bettas should not be kept in bowls at all. They should be in tank with filtration and a heater. I know this is not your betta, I'd take him. He is unhappy, the bowl is too small, should be 2.5 gallons at least, and when he blows bubbles it doesn't mean he is happy, it might mean he is doing this out of boredom. Probably he's dead by now.