Also, what are you using for a brooder? Those plastic rubber maid storage bins make great brooders or even cardboard boxes. I would shy away from glass tanks and all 3 sided things. The babies need solid flooring and solid walls to keep drafts down.
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It's probly your thermometer like TwoCrows said, mine was reading 110* way too hot, but they were always huddled under the light, so I went to DG and got another on and it read 80 so I adjusted and now everyone is happy and warm.So sorry for the loss on your baby. Your thermometer may not be reading right as new hatchlings need to be started at 95 degrees. You do not want to cover the lid of the brooder with anything but some hardware cloth or something similar. You need good heat and oxygen exchange at all times. Keep the heat source off to one side, with the thermometer on the floor directly beneath the lamp. The food and water off on the other side so they have to leave the heat to get to the goods. Lower the heat 5 degrees each week for 6 weeks.
I think your thermometer is not reading right. 87 is way too cold for new babies. And if they are still trying to run from it, there is something going on there.