I see a lot of plans for people using the 3 inch pvc tube that goes downward into a sweep tee. Could I use 2 inch or will the opening be too small as the chickens get older? It looks like they would have plenty of room. My only guess is why they choose 3 inch is because it will hold more feed. Has anyone else used 2 inch? It would be good to take up less space their enclosure and am considering doing the two inch with riser leading outside the coop and have a hopper made out of a 5 gallon bucket. Thoughts?