Discolored quail egg

[Coturnix cukoo]

Hello
I have 8 Coturnix quail. They are 2months old. They were all laying normal healthy eggs until a week ago, when one started coming out rough with discoloration and a soft shell (it’s always cracked/ broken). I’ve read that this can indicate calcium deficiency. What’s the best way to supplement with calcium? And since it’s just the one hen having problems should I offer to the others as well?
Any other thoughts ?
Thanks in advance

 

[Nabiki]

I was going to say that looked like not enough calcium. I provide a dish on the side filled with oyster shell crushed to quail sized pieces or crushed egg shell.

 

[Coturnix cukoo]

Thank you! Do the oyster shell and egg shell need to be powder or just small sized chips?

I was going to say that looked like not enough calcium. I provide a dish on the side filled with oyster shell crushed to quail sized pieces or crushed egg shell.

I was going to say that looked like not enough calcium. I provide a dish on the side filled with oyster shell crushed to quail sized pieces or crushed egg shell.

 

[Nabiki]

Thank you! Do the oyster shell and egg shell need to be powder or just small sized chips?

Small sized chips