Daysranch,
When and what did you worm your birds with, and what was the dosage?
Do you use a periodic cocci preventative such as Corid in the water?
Intestinal worms, cocci protozoa, Histomoniasis aka Blackhead (a condition spread by protozoa carried by cecal worms), ectoparasites like mites, poor diet, are all potential causes of anemia, which this bird has.