I bought my betta fish nearly a week ago. He appears to be a very happy fish, swimming around often and exploring his tank. He does not show any obvious signs of sickness, as far as I can tell, but he refuses to eat. He just seems entirely uninterested in the food that I offer him. Is it possible that the air pump scatters the food before he gets a chance to eat it, or does he simply not like the food and I should try something else? For the record, I'm feeding him BettaMin Tropical Medley. Thank you for your help!