Hatched 12 runner ducks in the last 48 hours. All look great. Came down this morning 1 dead and two died later, all were at the far end of the brooder when I cam downstairs, away from the heat lamp. Another has just died. The rest are lethargic. Please can someone help. They are on bathroom towels changed everyday. Heat lamp at one end with temp at 85-90 under the lamp. Crumb and water with niacin in it. Please can someone help. My children are devastated. I just want to save the rest if I can. Given them scrambled egg just now. No one has eaten it.