Is my chick okay?

[Barbwire54]

2nd day: Overnight we lost the Yokohama roo and one of the Yokohama pullets. Today we ran to the co-op to buy sav-a-chick and when we got home one of the Crevecour was dead. The Crevecours seem to have a pasty butt problem. Out of 8 straight run chick, four have had to be.cleaned. We've added ACV to the water as well. The chick with the injured beak is still segregated as well as the Crevecour that seems weak. Still sticking it's beak into the water periodically as it struggles to resist so I'm not sure why it isn't doing better if it has the strenght to fight me. It just huddles under the lamp cheeping. Any input would be appreciated.

Pics of your brooder setup?

3rd day: Overnight we lost another of the tiny Crevecours. Now the rest are doing fine while the one with the injured beak is still in isolation. He hates it! Goes on "I'm PO'ed" cheeping rants. We also pulled another one to put in isolation due to its rear end feathers being plucked out. No pasty butt and we aren't sure if it was self inflicted so some antibiotic and off to the isolation room. Everyone is eating and drinking very well and have the right intervals of activity and rest so I am at peace! Hate we lost those and plan to replace the Yokohamas, but may try a different supplier.