I think it takes them awhile to adjust to their surroundings, as well as new food, the first 2 days I had my new bettas they didnt eat anything. I heard they love peas so I warmed a few frozen ones up, chopped em up and put some in, they all automatically gulped them up..just to spit them back out LOL..the third day though they were curious and started trying different foods, some they spit out, others they ate..now they eat like pigs, especially my opaque one, hell eat whatever I put in the tank.
Annoying aren't they? My newest boy is extremely shy, and will not come to the surface to eat. SOooo he's spoiled rotten, and I drop in frozen bloodworms, brine shrimp, and peas. He took forever to even eat that stuff! Your fishie probably just likes his food moving, have you tried dropping in his food so it doesn't float? You probably will have to try a lot of things before he finally starts accepting other food, I know it's been that way for me a few times. Eventually he should start eating flakes/pellets, don't feed him for a few days if you have to, hunger is a good motivator (and it won't hurt him any).
