I made a pvc feeder similar to this one (not my picture-it's from another thread) The feed doesn't go into the horizontal part on its own very easily. Do they have to peck the feed to get more to come out? Or do I need to mess with it every time the bottom part gets low? It is 3" pvc and I have 2" holes cut in it. Right now they can fit their heads in but I'm afraid that when they get full grown they won't be able to and we'll have to cut out a bigger area.