How many mg are the pills? Here are some more questions, how long did it take the first one to die and how long did it take the second one after the first? If your bird has blackhead you will see something, drooping wings fluffy feathers laying down something? It doesn't sound like blackhead to me. My friend lost her midnight peacock and told me the bird just dropped dead on her and did not look sick at all - I said impossible, it had to show something and she missed it. She said it did have a runny nose a month or two before it died. Respiratory infection that would've been cured with a shot of Baytril or Tylan 200. Who else is in the pen with them? Do they look sick? You said you still have 9 peas from last year, what about them? They would be the ones who would get blackhead. Can I also ask who told you to treat for possible blackhead? Stress can cause a pea to get sick, stress can actually kill the bird as well. I had a bird arrive with a runny nose and crusty eyes from shipping stress. I also had a hen get chased by the males and when I seen it happen I went down and separated the hen, I found her dead later in the day. I do not know how long she had been chased for but she was panting like crazy when I moved her and I guess the stress was too much for her. What I am saying is stress can cause a bird to get sick and poop like any of the first 4 pictures in Kathy's thread just remove the blood and also a lot of water consuming will make the poop watery.