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.
Sweet. Ill put some black construction paper up on the tank. I tried leaving the rat picky halfway in his hide overnight (worked for my last ball). Thanks!
Ps. I didn't know you could put them in the paper bag with the rat. I need more tricks like that!