Make sure you get him a buddy! Rats can't live alone 
Also - be aware that the bitting may come back. Neutering greatly reduces territorial/hormonal responses such as bitting, lunging, and hissing. So, just in case, make sure you have a good rat vet and enough money for a neuter!
Also - be aware that the bitting may come back. Neutering greatly reduces territorial/hormonal responses such as bitting, lunging, and hissing. So, just in case, make sure you have a good rat vet and enough money for a neuter!