Hi all. We are getting our first hens today! Two are already laying (10 months) and two are 11 weeks old. 1. Do I need to keep them separate? 2. Can they all eat grower feed and oyster shells? I have a feeder and a water for in the coup. Can I just keep s bowl of water in the run (if I put fresh water in everyday)?? The diatomaceous earth ... How do I give them access to that for dust baths? They have a ramp from their run (which is fenced with chicken wire not hard wire) into the coop - do I need to close off this chicken door at night?? If so, what's the best way? I've read some forums for some of these topics but want to make sure I'm not misunderstanding. Thanks and so excited to have access to such great information!!!