Hello everyone I'll be getting 15 rhode island reds here in a couple weeks.. They will be semi free range in a 100×150' cage.. The thing I'm wanting to do is add a hanging feeder that is full of just calcium (oyster shells) and Grit mixed togther always accessible for them? Would mixing them be a bad thing? I know they don't need calcium young and grit if they free range but I'm gonna supply it anyways in the coop.. I'm just worried about mixing them in one big feeder?