Oyster shells are a soluble form of calcium and not hard enough for suitable grit.Ill try that over night regiment. I do supply calcium grit and we live on sand, they eat sand all the time. Thanks for the advice
They may be able to find suitable grit in sand if there's large enough pieces. If you find they aren't processing foods very well, then purchased Granite Grit placed in a cup in the run would be a good idea.