Quick comment regarding your diarrhea.
Have you considered your birds might have worms? Best is to get a fecal float at your vet to know what you're dealing with, but in the mean time some organic remedies include
Pumpkin seeds (with hull)
Diatomaceous Earth (food grade of course).
Using either of these can only help and not hurt your chicken, so It's ok to start these while you continue your search for the answer. If the symptoms dissapear in the meantime, you'll know you had worms!
I've rescued several chickens and they always come with really bad diarrhea. I start them on 2-3 tsp diatomaceous earth mixed into wet cat food...usually within 2-3 days they're poops are normal, and I lower their dose of DE to 1tsp as maintenance (either through their feed, or in their treats).
Good Luck
Sandra