This is my first time to raise seramas, and all 4 of mine have a grape sized crops. They are only 2 weeks old. It feels a little firmer than a water balloon, and didn't know if that was normal. I changed their brooder yesterday and put in some fresh hay. They are eating 20% starter that has been ground, and water nothing else. They are active, eatning, drinking, flying on top of me head, and pooing. Please let me know if this is normal, and if not what do I need to do?