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It's normal for birds to investigate and occasionally eat the oyster shell. They will not consume more than is good for them.

The layer feed will not cause any serious issues, right away. The kidney problems are from a long term, cumulative effect. With lots of daily treats, a higher protein feed is a much better choice. Just be sure to have crushed oyster shell out for those who need it.

Regarding feed - medicated starter doesn't usually contain any sort of medicine. It usually has a thiamine blocker. And it's such a low dosage, that any that makes it into the eggs is not going to be an issue. As for something that is safe for all, switch to a grower, flock raiser, or all flock...