I am very new to chicken raising. Just got my pullets 1 wk ago. They are all 12-14 wks. I have 2 buff orps, 2 barred rocks, 2 RIR, 2 australorps, and 2 golden laced wyandottes. They had been doing good. I have a 6x6 cedar coop and a 6x12 fully enclosed run. I have not let them free range yet since I just got them. Our temps here in North Texas have been 100+ every day. I have been putting electrolytes in their water. I feed starter food and have been given them scratch, some watermelon and lettuce so far. Today when I got home and was checking on them I noticed a few poops that were bloody with mucous in it. I sat in the run and watched them when I gave them some scratch. They all came running and ate. None of them appeared sick that I could tell with no experience yet, just a great want to be a great Mom. Please any advice would be helpful. I'm afraid to come home and find them dead.