curled up toes & falling over

[chickenstupid]

i have some babies (week old marans rir buff orph australorps) that i got at a flea mrkt all looked good and then one got goofy footed and falls over 6died one night and 3 about 2 days later dont know why (overcrowding? 25 n a tub) anyway now a couple more have become goofy footed they r eating & drinking if i put them by the feed chirping & look ok other than the goofy feet &stiff legs they eat chick starter get fresh water & pine shavings 4 bedding