We started with 12 chicks and 1 bantom. All were laying fine and all seemed to be going well. We bought some feed, had two chicks die and the only change was the feed which turned out to be regular size pellets rather than mini pellets so we changed back to minis. This was within 3-4 days of each death. Now the bantom has died. It doesn't seem that anything is getting in the coop, no warnings, nothing. We live in the panhandle of florida and the temps are high but how high is to high for chicks before it's deadly? I saw somewhere on here about worms? Are they deadly? Give me some ideas to help, the flock is slowly dying on me!