So sorry for all of the losses. I do hope that you will not lose any more chicks. I really think that the main problem probably stems from getting them in such a cold time of the year, especially coming from a long way, and then the sub zero temperatures last week. They had to have been in transit for at least two days or more. Stressed chicks tend to have pasty butt and may have suffered chilling even in such a large shipment. Personally, I would wait until March to order chicks, and get them from a closer source. I get mine overnight from Meyer hatchery in Ohio, and they supply a lot of the chickens sold by MyPetChicken. Even at that, I will dip beaks in SaveAChick electrolytes or NutriDrench, and show them the feed crumbles as well as the water a couple of times. I like to have them in my house where I can control the temperatures for 2 weeks, and watch for problems. Even will doing that, if there was a bad hatch, it is still possible to lose some. Hopefully, they will start getting stronger.