Originally posted by Godzilla
The shells themselves don't bleed though, thats from whats under 'em.
No, the turtle shell itself can bleed. It's not JUST a hard material like finger nails, yes their shells are bone-like, but they do have a blood supply in their shell (and nerves too).

Originally posted by FireFightersFlame
When they bleed can you wipe the blood off to see where it's coming from? Does it wash away cause these spots aren't changing or going away. And I am very curious as to how he could have hurt his shell cause I handle him with such care. And like I said, there's nothing in his tank that could hurt him.
Hmmm? I don't know, I would imagine you should be able to whip the blood off. Does he appear to have any chips or cracks in his shell? I don't know too much about red-ear sliders specifically, as I have 3 sulcatas, which are land turtles. I don't visit This forum too often, but you may want to check it out. They have a specific section for turtles and someone may be able to help you there.