We are preparing to transfer out 6-week old chickens to their coop. The attached run will be filled with sand. Is this suitable grit? Finding grit has become an issue because I recently discovered that my feed store's grit includes oyster shell (you might have told me that before I feed it to young chicks, Agway!! ) Luckily, I didn't give them much. Since then, I have been digging up a pan of dirt (my dirt is full of pebbles) but this is too much trouble to do every morning, especially getting up at 6:00. Is the multi-purpose sand OK grit, or do I have to find another solution?