Thank you all for your responces im going to toss the rat and try again next week. I check all temps and humidy and all is well, nothing has changed in his envirement he just decided not to eat for the first week in his life lol. Ive heard its not uincommon i was just worried because of how aggressive his feeding reponce ussually is. Normally when a rat enters the same room he strikes at everything that moves trying to eat it. But mabey like everyone said hes just self regulating. Thank you all for the responces, it helps calm a concerned dad.