Coccidiosis suspected, getting new chicks soon

[Olychicken]

I have two 4 month old girls in my coop at the moment and I suspect one or both have coccidiosis. I found bloody poop in the coop yesterday and one of them has a pale floppy comb and she was panting today. I'm treating with corid in the water (started yesterday afternoon) but they aren't eating or drinking much. Today I gave them some medicated water in a dropper. I think I'm doing everything I can for them but if anyone recommends anything else or more I would be grateful for the suggestions!

I am also raising 4 more chicks who are 3 weeks old so they should be joining my other girls soon but now I'm wondering if that is safe and how I should handle introducing them to the coop.

 

[Eggcessive]

Are the 4 month olds getting outside to free range? Are you keeping the bedding as clean and dry as possible? Usually most 4 month olds have built up tolerance to coccidia in the soil if they have been there for awhile. Have you wormed them recently? Do you have any pictures of the bloody poop or other droppings? What strength of Corid are you mixing? I would use 2 tsp of the liquid or 1.5 tsp of the powder in each gallon of water. Also you could give each chicken 0.1 ml per pound of the undiluted Corid into their beak once or twice daily as a boost. If they are eating, you could put a little of the Corid water into a small batch of feed to get them drinking more. I would consider worming them with either Valbazen 1/2 ml orally once and again in 10 days, or SafeGuard Liquid Goat Wormer 1/4 ml per pound of weight for 5 straight days, given right into their beaks.

 

[Olychicken]

Are the 4 month olds getting outside to free range? Are you keeping the bedding as clean and dry as possible? Usually most 4 month olds have built up tolerance to coccidia in the soil if they have been there for awhile. Have you wormed them recently? Do you have any pictures of the bloody poop or other droppings? What strength of Corid are you mixing? I would use 2 tsp of the liquid or 1.5 tsp of the powder in each gallon of water. Also you could give each chicken 0.1 ml per pound of the undiluted Corid into their beak once or twice daily as a boost. If they are eating, you could put a little of the Corid water into a small batch of feed to get them drinking more. I would consider worming them with either Valbazen 1/2 ml orally once and again in 10 days, or SafeGuard Liquid Goat Wormer 1/4 ml per pound of weight for 5 straight days, given right into their beaks.

I put them out at 6 weeks and they've been outside since then. They had much more space to free range previously but they've been in their coop/small run area for the past week because we just lost 2 to hawks. Inside the coop I have chopped straw and sweet PDZ that I change weekly plus nesting pads in the nesting boxes. I have never dewormed them, is that something I should do regularly? I am using corid 9.6% at 1.5 tsp per gallon, I'll go add another 1/2 tsp to the water.
Is it safe to introduce new chicks into the environment in a few weeks? I would assume I need to clean the coop thoroughly but is that enough?

 

[Eggcessive]

Worms can also cause blood in droppings, so worming might be something you would want to do. Just make sure that bedding is dry as can be and add fresh bedding as needed. Watch chicks for signs of coccidiosis which is most common at 3-6 weeks of age.