OK -- Here's a link that will give you the right treatment - you should treat your whole flock. I'm guessing that's what's causing the weakness and the paleness.He does have lice.
My rooster is currently molting too, but he's out taking dust baths and watching over his girls just a little lazier as molting takes just as much outta your roosters as it does the hens., they do go through cycles, but I would definitely follow eggcessive's adviceHe eats fine and he used to be in a super dark pen for a few weeks and was just let out free range, it wasn’t the largest cage in the world, but it was big. Do you think it was a lack of sun?
Might be stressed from being put back out in it. He's going to follow the hens, so if they were used to the heat, he might be all worked up from being out with the ladies again, if that was the case? Maybe let him out half the day for a bit, days are getting cooler now, shouldn't take long.He eats fine and he used to be in a super dark pen for a few weeks and was just let out free range, it wasn’t the largest cage in the world, but it was big. Do you think it was a lack of sun?
Just wondering, why do you think he’s molting?He looks like he is molting, and that also can take a toll on any chicken. I would treat his lice with permethrin 10 spray or dust, onece and again in 10 days, or use some pour on ivermectin 0.1 ml for every 2 pounds of weight. Repeat ivermectin in 14 days. Clean out coop and spray the coop, nests, and roosts, and add new bedding.
Offer some poultry NutriDrench 2-3 ml daily, or give some electrolytes in his water. Offer food up to his beak often including some scrambled chopped egg, tuna, and a little wet feed along with the dry feed.