Honestly, I don't know how much they are eating, but it doesn't seem like much lately. They are 10 weeks old, and I still give them med chick feed, but I let them range in the yard most days, and they seem to be finding lots of snails, insects, and grass to eat, but I don't refill the feeder as much as I used to. Will this slow their growth? Do I need to keep them in the run more?