hi! i was planning on getting a 5 week old chick but was just reading up on the troubles that can occur when introducing a chick to an adult hen. i don't know if i want to risk it, especially being new at this. anyone have one for sale that is already big enough to hold her own? Also any advice on how old that is? i've read something conflicting theories. i've heard anywhere from 8 weeks to 16 and everything in between. thanks!