I picked up a few rats from a breeder last weekend, and while one is going to be fed off, a male that I wanted to breed is sneezing off and on. It's not just a sniffle, its a full sneeze. I looked him over and there's no eye or nose discharge, his fur is good, rear end good, and he's eating and drinking fine. I put vitamin drops in all my feeder/breeder water bottles... Is there anything else I can do? Currently he's in a tub alone but still in the same room.