Our 5YO beloved Royal Palm got blackhead. Six years of keeping birds, NEVER experienced it. I was in a PANIC? You saved her life! Your post from a few years ago about using Metronidazole, Enrofloxacin, Fenbendazole, and Toltrazuril, including dosages and frequency, with steps 1-4 of action, was vital. The information about the E. coli was so important. My husband and I can't thank you enough!