How long have you had him? If it is less than a week I would not even try to feed him at all. Bp's need time to adjust to their new surroundings. I usually feed live for my first few feeding until I am sure that it is nicely settled in, unless it was already eating f/t. After a few feeding I wait a few days longer than normal to feed it, then feed the f/t... It has always worked for me....