I'm not sure about the eating. How much are you offering him? Their stomach is only as big as their eye. As for the bubbles....Congrats! lol. Bubble nests are how make bettas say they are Happy and Ready to breed. When they breed, it's where the males place the eggs.
Abba (and Jose)
RIP: Copper 5/29/2011, Abigail, Eleanore
Rehomed: Angel, Cotton Candy, Fetti, Lavender, Alice