I would not bother a vet, unless he gets diareha or don't eat.. I think he is eating fine and poop is fine. I just noticed his nostrils were closed up.. He looks healthy.. Let him get used to his new enviroment. You can go to a pet store and buy some vitamins or meds to clear his sinus drainage problem. It is between $8 to $15.. Just add a drop in his water. But as long as his apetite is good, well he is healthy..