Its unusual to get a chin that bites as you are describing .How long have you had your chin
Castration does not calm a chin down like it does with a male dog
It is possible to introduce 2 males , however you would need to ensure that you have space for 2 cages side by side for as long as the introduction process may take
You would be welcome at
ChinsRus - Chinchilla rescue and forum where we have lots of info on intros etc
