I have 12 chicks. Two are 4 wks. old and 10 are 2 wks. old. I've been spending time with them so they don't scatter when they see humans and use treats alot. Usually shredded cheese, sunflower seed or hen treats. And in this heat I've been giving them a quarter of a watermelon per day. My question is how much is too much when it comes to giving treats.