I have Silkies, they are too small to eat regular oyster shell, I set it out for them and they just ignore it. One of my girls has been laying soft eggs for a week. Even on the end, it's like the shell isn't even strong enough to develop, and she lays an "open egg" that has a small hole in the end. Poor thing. Anyway, I have calcuim supplement pills for myself that are made from Oyster shell, can I just use a mortar and pestle and grind up my vitamins and sprinkle one on her food? Or has anyone had any luck with the calcium powder that they sell to reptile owners in pet stores to sprinkle over crickets that lizards eat? I'm trying to think of a creative way to get some calcium down this hen so her poor eggs firm up.