Hi everyone , I have recently gotten 3 little silkie chicks. They are almost 4 weeks old and I've had them since they were two weeks. They are amazing I've fallen in love with the three little guys! They have been eating "chicken starter" only and today they had a peice of watermelon. They went absolutely crazy for it and ate it all in a few minutes. Afterwards I googled and came across a few websites saying they need grit or sand? Can someone explain this to me. Where do I get grit? Or can I just give them sand (the kind purchased at the hardware shop). Do I put it in with the chicken crumble? Thanks in advance just feeling a bit confused about it.