Please read post #2 & #4 in this link. It explains how to orally worm chickens.
https://www.backyardchickens.com/threads/worms-in-chicken-poop.1575508/#post-26765905
You can also use Tricide Neo to treat bumblefoot. Here's a link if you dont want to do bumblefoot surgery: See post #2.
https://www.backyardchickens.com/threads/treating-bumblefoot-with-tricide-neo.513183/#post-6526194
If there's no improvement after using Corid, worm your birds with Albendazole. Worms can cause blood in feces. Here's where you can order it:
https://horseprerace.com/albendazole-oral-liquid-for-horses-cattle-sheep-500ml
Please read post #5 in this link:
https://www.backyardchickens.com/threads/weight-question-with-dewormer-and-how-long-to-treat—-site-won’t-load-previous-forums-for-me.1664386/#post-28609598