Has he been pooping normally? Do you notice any straining? I would soak him in warm water every day for 20-30 minutes in a large container like the tub so if this is the start of a blockage, the walking around the tub and the warm soak will help get things moving. I would also keep an eye on him and make sure he poops regularly, not straining and check it for parasites. I would do,this until he poops creamy urates. That's just my opinion, see what Yvonne says.
@Yvonne G might know if there is another food or something else that would cause this color.
I've seen this with my Russian. Another way to increase hydration is to either spray the food with water or to rinse and put it in right away
The color of slight pink is not an issue...the gritty texture of urates would be the concern....I would offer warm water soaks for no less than 30 minutes (and make sure to keep the water warm).....I would also offer some "wet" type foods--squash, zucchini, green and red leaf lettuces as well as romaine...this will allow the tort the ability to take in additional water while enjoying a treat....the goal, in my opinion, is to try to achieve no urates....