My turtles have a slight pink tint to the underside of their shells, and at first I thought it was because I fed them dried shrimp food stuff, but it's been over six months and they still have a lil pink. . . What else could be causing it? And is there anything I can do to help it? They are about 3 inches and 3 and half inches...both growing great since they've been in their new home! Here is the clearest pictures I could get:
Any advice would be great! Thanks!!

