I am new to owning chickens. The majority of mine are now 18 weeks old. I have an olive egger rooster who has been large and healthy. He was the first to start crowing, but stopped the week after. That week I lost two chickens with only a few hours' warning suddenly to coccidiosis. They were around 9 weeks. I started treatment with corid immediately. 2 tsp/gal for 5 days, then 1/2 tsp/gal for a week. After they were off the preventative dose, some were acting "off" so I put them back on again. Recently, I took the olive egger roo to the vet because he was too light and he was also diagnosed with coccidiosis. However, he was still very lively. At that point, I put them on 2 tsp/gal for 7 days, then on 1/2 tsp/gal until tomorrow, which will be another 7 days. We also treated him with Panacur (de-wormer) for 5 days as a precaution. Yesterday I noticed he stayed in the coop all day which was unusual and his tail was down and he was kind of hunching. At night, he was totally weak in the legs, couldn't even jump a foot, with his poop mostly water. His appetite was good. I switched them to a new medicated feed yesterday (should have mixed it but I didn't have enough left to). I also gave him a few drops of Nutri-drench. I also put him in front of AC unit because it's been so hot here (side note, coop is concrete sand and we have an A/C unit in there which keeps it around 80 degrees). He was able to jump on a chair with some effort, so I put him back out to sleep with flock. This morning, he wanted to graze outside but stumbled over the door frame leaving the coop. He was just sitting in the grass. HELP! I don't know what to do at this point. I'm so sad. Do I up his corid dose again?