Just a suggestion: you may want to try to blacken out the sides of his tank. It helped mine get used to his new surroundings. He went from a 6 quart tub with his breeder to a 10 gallon tank. Some people use black boards, while I use black shelf liners taped to the sides. Some BPS may not need it, but mine did.

My 2 month old BP also refused to eat FT after several attempts ( leaving it overnight with him paper bag trick etc). I've had to start him with a live pinky as well.

Good luck!