HuskerHens18
Crowing
Hello! Back again in my usual forum section 
I've got a Favorelle x ISA brown cockerel who hatched April 4th.
He was the biggest chick, and definitely most fluffy.
Sadly that was short lived as he's now the smallest chick. He's bullied by his other cockeral and pullet flockmates. Yesterday I found him hiding in a nesting box and refused to come out. When I took him out he is pretty thin, which I presume is from being bullied out of the food.
He's currently in isolation with a friendly pullet.
His comb isn't very red, it's kind of dull colored compared to other cockerels his age.
He lays down a lot, rarely standing unless I bother him. He seems to walk fine, no limping.
His tail is droopy.
He prefers the sun over shade... it's about 85°F right now and very humid. His cage is half shade-half sun, he is laying directly in the sun whilst his pullet friend is in the shade.
He seems to stretch out his wings a lot, but pulls them right back in close to his body.
He is eating, but not as much as you'd think for being so hungry.
He is drinking pretty well.
His poop appears normal.
I have given him Nutri Drench straight down his throat.
He is currently being fed Nutrena Chick Starter Grower.
He has JUST finished his final round of Sulfa powder in his water. We have a strain of coccidia that's immune to Amprolium.
He was also on an anti diarrhea as told by vet.
I'm currently trying to look at his feet pads, but he's extremely fiesty and has drawn a lot of blood when I previously tried to look.
I will post pics in comments after a bit, my WiFi is bad and isn't letting me post pictures right now.
What else can I do for him?

I've got a Favorelle x ISA brown cockerel who hatched April 4th.
He was the biggest chick, and definitely most fluffy.
Sadly that was short lived as he's now the smallest chick. He's bullied by his other cockeral and pullet flockmates. Yesterday I found him hiding in a nesting box and refused to come out. When I took him out he is pretty thin, which I presume is from being bullied out of the food.
He's currently in isolation with a friendly pullet.
His comb isn't very red, it's kind of dull colored compared to other cockerels his age.
He lays down a lot, rarely standing unless I bother him. He seems to walk fine, no limping.
His tail is droopy.
He prefers the sun over shade... it's about 85°F right now and very humid. His cage is half shade-half sun, he is laying directly in the sun whilst his pullet friend is in the shade.
He seems to stretch out his wings a lot, but pulls them right back in close to his body.
He is eating, but not as much as you'd think for being so hungry.
He is drinking pretty well.
His poop appears normal.
I have given him Nutri Drench straight down his throat.
He is currently being fed Nutrena Chick Starter Grower.
He has JUST finished his final round of Sulfa powder in his water. We have a strain of coccidia that's immune to Amprolium.
He was also on an anti diarrhea as told by vet.
I'm currently trying to look at his feet pads, but he's extremely fiesty and has drawn a lot of blood when I previously tried to look.
I will post pics in comments after a bit, my WiFi is bad and isn't letting me post pictures right now.
What else can I do for him?