The all stock pellets definitely are not good for chickens. The other thing is to find out exactly what is causing them to lose weight. I don't know about FL but in TN, a flock cannot be put down without necropsy and without a "transmissible" disease that would be considered a public health threat (avian flu) in birds. My state vet will come to the property and get a sick bird to evaluate. He is very nice and understanding. It might be worth your time to find out. The gurgling one sounds like pneumonia. Once a chicken gets down with anything it is easy for them to get pneumonia. It is hard to cure in a chicken. Sorry you are having all this trouble. I know I would be beside myself, too.