Urgent Care :: Weird things in my RES tank!!!

[mistymtns]

So I was cleaning out my turtle tank and I found these long pink/red things( pic below). I have no idea what they are and definitely have never seen them before. I have a male and female in a 55 gal tank. They are approx. 6 years old. I have fed them pellets and sometimes guppies and lettuce every other day for the past year so I've done nothing new for at least a year. Please help!

[steve]

I'm not sure what that is. What does it feel like? How much of it was there?

[mistymtns]

It was pliable but not squishy. There was three or four pieces that size.

[steve]

Do you think it could be eggshell?