I switched over to nipple drinkers and really don't like them. Previously I had a big hanging watering container and thought I would be better off with nipple drinkers so that I can fill it from outside of the coop -- the problem is my chickens will not drink from the nipple drinkers. They have been up for about a week now and the water level in my bucket has not gone down at all and my chickens seem dehydrated with open beaks and they are acting aggressive towards each other, which they have not done before. I checked the drinkers to make sure they work and they are fine plus I showed them how use them but they will not drink. I was really liking the setup but it looks like I must scrap the whole new system. Any suggestions?