Hi- i recently incubated and hatched around 19 valley and gambel chicks a week ago. First 5-6 days they are all doing well (growing and running around). Last 3 days I have lost 8 and I have found them grow lethargic within a few hours then pass. they are in a brooder with a red lamp, consistent temps, clean water and on 30% gamebird starter crumble. Any thoughts on the cause? Today I have added electrolyte to their waterer to prevent future deaths. Thx in advance.