blackish grey sounds like a blue Marans or Ameraucana. Male RB's have a white spot on a light brown head, often they are more caramel colored than "brown", but always with the big white spot.
There is definitely a gray chick! I'm trying to send you a pic, but my phone is not cooperating. Will try to snap a pic later to upload. I hope it's a female blue Maran. The one that I had raised for Rose was so calm and sweet, and what a fun color! If you would like that one back because it is worth more to you, that's fine also. . Four chicks hatched, which is pretty good consider the constant interference of the other girls in her box.
She was back this morning, which is AWESOME, we were all thrilled as that usually doesn't end well around here.
Thanks for the reassurance. I don't know what I'll do as for the hatching chicks and everything. The *only* thing that she said led her to believe it was Marek's was "thickening of the sciatic and femoral nerves". She said Marek's is the only disease that does that, but she suspected it, and could never be 100% certain. That I could try treating for a B-vitamin deficiency. There were no tumors on the bird (they weren't in the report).
Glad the Serama came back! Hope she hatches out some cuties for you.