Chicks that have no use of one leg(or both) & no balance - any ideas?

[Wyorp Rock]

Thanks again for all your help guys, certainly is appreciated, unfortunately the one thats been like it for weeks died this morning - I'd like to say unexpectedly but although no so much unexpected it was rather sudden especially she had been fine all day yesterday. The other is currently seeming a lot stronger everyday so there is hope yet.

I'm sorry for your loss.

Hoping the other one continues to improve.