You know what amazes me is how some people say that tortoise's have no personalities. I beg to differ. I think they are very sensitive and will show what they like and don't. If I bob my head up and down, Scooby will do the same.
One thing I would suggest is Tortoise Eye Drops. They can be found at the pet shop. Ours had eye infections a couple of times. We put them in once a day and after about a week/week and a half, she was much better. Also give him some nice luke warm baths to kind of rinse out any possible dirt or...
Yours might be a female. They tend to grow slower. You usually can't find out until about 5 years. The other thing we think has an effect on their speed of growth is how large of a space they have for a habitat. We just enlarged our habitat about a year ago, and it's incredible how fast she has...