We had a heated larger 3 gallon plastic water container (hanging). We have 12 chickens and just changed the water container to a new plastic nipple type. The old one was leaking. What my question is.... what is everyone's experience with the nipple type with the nipples attached to the bottom? Do we need to do something special to get them to drink from it? I was out there for about 10 mins and none were going to it to drink. Is there a special height from the ground? Thanks!