Need quick help - chicks with bloody poop, on medicated feed - can I give Corid?

[Wyorp Rock]

Poop looks better this morning. Some reddish, but not the bright red, stringy from the last two mornings.
I had one chick that spent all of yesterday puffed up and sleeping standing up. She’s moving around this morning, eating and drinking, and scratching some.
I gave her another drench dose,
The others are all behaving normally.

Glad to hear things are improving!