You've given an outbreak dosage for 7days and a preventative dose for 5days.We finished
Yesterday was day 5 on the preventative dose after 7 days on the severe. I found this dropping this morning (no blood). Should I continue two more days with CORID?
No. I would not continue with treatment.
Make sure the chicks are eating their chick starter very well and drinking to stay hydrated. They should also have a source of Grit (Crushed Granite) available free choice.
Are you feeding any type of treats?
The white in the poop is urates. Make sure they are drinking.
It wouldn't hurt to get them on some probiotics for a few days.