Black spots on or inside the shell

[Tank!]

My turd Tank has some black spots on the shell. Seems that it may be from underneath the shell or the shell itself. Does anybody know or have seen this before . I apologize if this has already been a topic on another thread I couldn't find

Thank you for any replys
-Tank

 

[Yvonne G]

It's just the pigment. Nothing to worry about.

 

[Tank!]

Thank you for the reply!