I bought a Betta at PetsMart a month ago and he has not eaten a single bite of food. He is in a large, large bowl with a plant, a heater and a floating log. He builds bubble nest and seems happy. First I bought him the Tetra Betta food but when he did not eat that I bought the Top Fin food. The only time I saw him eat he spit it right out. The other times he smells the food and swims away. I am SURE this is not normal, but one month later and he's still alive. Any suggestions???