Rach hit them with stress coat or something similar... Neons are a real shocky fish and can die from shock days after they arrive. We had a tank of 100 start to go belly up and I had the girls hit them with a heavy dose of stress coat and it seemed to slow it down we lost about 25% when it was all over but the rest seemed to pull out of it....
A small dose of aquarium salt will work in a pinch if you don't have stress coat.
A small dose of aquarium salt will work in a pinch if you don't have stress coat.