Probiotics after corid treatment?

[Hopeful homesteader]

I know I'm supposed to give probiotics after corid treatment but I'm not sure if I should start the day after the last treatment or wait a few days? Then how many days do I offer probiotics? I have save a chick probiotic and electrolyte packets, do I give electrolytes for 1 day also or just the probiotics? I plan to give the older birds some probiotics also for a boost before introducing the chicks just in case but I'm pretty sure they've already been exposed and have been fine since the chicks issues started after bringing dirt/grass and bricks into the brooder from my backyard. I removed the grass/dirt but the bricks are still in the brooder to keep the waterer up higher with paper towels under them changed daily to prevent excess moisture from water spills, I think it was the puddle under the bricks originally that caused the cocci overgrowth. Now that everything has been fixed, I need advice on probiotics and electrolytes going forward.

 

[Hopeful homesteader]

?

 

[Wyorp Rock]

Just give them some probiotics for a few days.