Please help, about a half hour ago my normal healthy vigerous chicks that hatched yesterday were going about thier buisness as usual, my daughter was holding her favorite. When she put her back in the brooder we were all standing around watching them. Her favorite started acting odd, pecking her feet cheeping loudly then stumbling, falling over, chirping loudly then flopped around with siezures and then went limp breathing heavily with beak open, and died. Before that one was gone several more started doing the same thing, and within 10 minutes there were 5 dead. Most of the others are acting the same way but instead of falling over they were pecking at thier feet and stumbling, and laying down, breathing heavily, and suddenly jumping straight up like having a spasm, kicking thier feet like they had something on them repeatedly. I have been raising chicks for 7 years and never seen anything like it I dont know what is happening please help!!!!!