Hello i have just got a russian tortoise 2 weeks ago for the past couple of days one of his/her eyes seems a little hard to open and when it does open it looks a little smaller than the other one, he rubs it sometimes too. today i tried getting a cotton round with some water and dabbing his/her eye softly. it does still look healthy and black so i don't know if this is an infection or injury. What should i do?