Put some vitamins in the chick's water or give it 2 drops of baby vitamins every day. If you can google chick with curled toes, there is a good link by TheChickenChick.com and another by Poultry Pedia Podiatry to make shoes for this. Humidity problems or temperature spikes can be causes of foot problems, but early treatment might help. Using a chick chair can get the chick upright to use it's feet. It may not work, but you might be successful.