We just purchased 2 russian tortoises from a local pet shop and they both seem to being doing well but the one has been scratching at his left eye on and off since we brought him home. He keeps it open most of the time but then closes it for a minute or two now and then. It doesnt look irritated-maybe just a tiny bit runny. His other eye looks fine and he has been eating/exercising rigorously, so I am not sure what to think. Does he need to see a vet or could it be a simple fix?