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It's nothing serious. Just an overlay of extra calcium. :)

oh good! I crush up the old egg shells and feed that to them with my kitchen slop. Never have used the oyster shell, at least not for a year or so.

When I was doing my research for my oyster Shell post the other week, it said that egg shells aren't enough. shrug, some people do fine with them, I guess some don't! Haha