Hi All. I thought it would be a shame to let my ladies eggshells go to waste, so I washed them, got the membranes off, baked them, crushed them up in a baggie and then used a rolling pin to grind them into a sand consistency. So what is the best way to serve it to them? Do I mix it with their feed? Do I put it in with their grit and oyster shells? Any insight would be great. Thanks!