Check the butt. Often it's poopy from the runny stools from coccidiosis.
I got good at tubing birds when we had the botulism issue. Condensation or actual water got into the scratch and I hadn't noticed any mold until they started showing symptoms. Lost a few to it and had a couple hens who couldn't eat for days from jaw paralysis. Also when I found out to use the baby bird food because it's meant to mix with water and is fine enough to tube.
I got good at tubing birds when we had the botulism issue. Condensation or actual water got into the scratch and I hadn't noticed any mold until they started showing symptoms. Lost a few to it and had a couple hens who couldn't eat for days from jaw paralysis. Also when I found out to use the baby bird food because it's meant to mix with water and is fine enough to tube.