I'm trying to figure out what my 7-1/2 week old chicks need. I have them on starter crumbles, but I am starting to add in a few treats, such as mealworms. I've been reading that you should give them grit.....no, don't give them grit........they need oyster shells........no, that's bad for chicks.......they need both grit and oyster shells.......they don't need either one at this age........GAAAAAAHHHHHHH!!!!!!