I have six 3 1/2-week old chicks. I've started adding a little grit to their feed & have already given them a few mealworms & they've caught the occasional bug since their pen/cage is outside. At what age can I start giving them other treats like cucumbers & such? (cause I have a BUNCH of cucumbers from the garden) What about poly vi sol or apple cider vinegar in their water? For now I've just been giving them plain water. What about diatomaceous earth in their feed? How often do I need to totally replace their shavings with fresh ones? Do I already need to start letting them on the grass in a drop cage to get some grass & bugs? What about dust bathing? Would it be ok to put a container of sand & diatomaceous earth in their pen to let them dustbathe in? Sorry for all the questions...just want healthy, happy chicks.