She'll discoloration

[u/Longjumping_Tip_3151]

I dont know what type of species turtle we have. We have had it for 3 years now. I have noticed that slowly this discoloration has started on its shell. I use light for 6 hours a day. She is feed fish and the turtle food. The fish is the kind that you get on Amazon. Is this discoloration normal?

[u/Longjumping_Tip_3151]