So I've raised chickens before, this is my second time brooding. Last time was very successful, I'm sure due completely to all that I've learned from here. This time I'm having the worst luck! I started with 2 golden sexlinks and a rir, then I added 3 ameraucanas and a light brahma from another breeder, then from the same breeder as the declines I added 2 buff orphingtons and a speckled Sussex. All chicks are between 1 and 2 weeks old. Since Sunday, all 3 ameraucanas and the light brahma have died, and now I just came home to my super sweet Sussex dying in front of my eyes! I started treatment with corid, I've been giving electrolytes and probiotics for a few days (since I noticed they we going down hill). Their brooder is set at 89 degrees, I supply fresh food and water daily. I'm so frustrated! I just want to cry. What's going on with them? Anyone have any answers?