When I first got maxi BP he was undernourished, and horribly timid, he went 2 months with no interest in eating, Then I got separate 10 gal tank with dark cloth ,,,,thawed his frozen mouse which this time I picked a smaller one and within seconds he had got it....THe rest has been easy we always go to the quiet tank...throw in the thaw,,,and away he goes...He's not a big eater though. So sometimes he's just not interested I remove him try agian another day....It may be the hampsters frighten him he may have had a bad experience that the previous owner is not willing to mention, or does not realize....try smaller,,,,in dark secluded tank for his privacy...watch under the corner of covering to see he's okay. EM