Besides getting the setup corrected, you need to slow down a little. Generally, you should give animals that first week to settle into their new environment before offering food. Youngsters can get turned off feeding pretty easily if you push them too hard. I'd usually have most of mine eating by their 3rd week, post shed. First week I'd likely offer a rat, second week maybe a f/t mouse, 3rd week a live mouse for any who hadn't started up already. Trying too much, too fast, can easily work against you in getting youngsters feeding regularly. If you haven't already, ask the breeder what he was feeding on and that'll probably be your best shot at getting meal number 1 in him under your care.