I installed a nipple waterer a few days ago. It's hung about six inches above the chickens' heads, so they can easily reach it. But they TOTALLY ignore it. I have it in their coop/run, and no other water inside, but the old one is out in the yard so when I let them out in the morning they race over to it to fill up. I've tried standing there holding in the nipple so water drips down quickly, I"ve tried holding their heads and pecking their bills onto the nipples, but so far am failing. I could try to stick something tasty up there but if they don't even look, what's the point? What else can I try?