Utilizing egg shells pre-frankenprey diet

[Charlie]

You would need to grind up the egg shell to a fine powder for them to eat it. I found that the shell didn't get eaten much in chunks. I let the shell dry out first then I grind it up to add to the egg yolk. Even then I still find that some of it gets left behind.

[PatienceTheVirtue]

I'd be cautious with adding too much without balancing it out with muscle or something. The grinds are already complete and adding the egg shell can cause constipation like bone meal would, I'm pretty sure.