One chick dead, Two chicks Sluggish-- two-month-old chicks

[Wyorp Rock]

two remaining chicks, Noel and Nina (brahma and cochin), are weak, unstable, and seem very "groggy". I brought them inside and cleaned the coop. Nina's condition has been deteriorating while Noel is recovering....It may be coccidiosis but there is no and there hasn't been any blood in their stools. It gets pretty chilly here at night so we still have their lamp set up.

How are your chicks doing @SilkiesInSuburb ?

I'm sorry to hear that you lost one. I agree that bringing them in to get them warm was a very good idea.
What type of food/treats do you feed?

It's possible they may have gotten too cold, but it's a good idea to consider Coccidiosis as @Sagenovese suggested. Do you have photos of their droppings? Coccidiosis does not always present with bloody stool - there are several strains of Coccidiosis in chickens and if I remember correctly only 1presents with blood. Symptoms include - lethargy, huddling/puffed up appearance, going off food/water, loss of balance and loose stools with mucous or blood. Corid is a coccidiostat that can be found at most feed stores like Tractor Supply, it's very mild and won't hurt them if you choose to treat.

If they have bounced back/improved with heat, getting hydrated and eating, then most likely they were chilled and dehydrated.
Let us know how they are.

 

[SilkiesInSuburb]

Thank you all! I checked on them this morning, and I was sooooooo happy to see Nina and Noel running and drinking and chirping! I am going to give them some electrolytes and I will see if I can get a good stool shot.
@Wyorp Rock that sounds exactly like their symptoms. So I am not sure what to think--should I still give them some Corid if they are looking much better?

 

[Wyorp Rock]

If they are doing much better, then you may want to give them another day to see how it goes.
It's never a bad idea to have Corid on hand just in case. If you have a vet - they can perform a fecal float to confirm/rule out Coccidiosis.

 

[Sagenovese]

So glad to hear that Nina and Noel are bouncing back. That's great news! Please send us another update. I hope it continues to go well. The electrolytes are a great idea, too, as lissalischicks suggested.

 

[SilkiesInSuburb]

A success! Both chicks are alive and well and living outside with a light. They would not have survived without your help!

 

[SilkiesInSuburb]

Just an update if anyone was curious!

Nina and Noel are doing perfectly fine. They're three months old now, make hen-ish clucks, and chase each other around the yard. No illness has poked its head up yet.
Nina is for sure a cochin bantam, and Noel is for sure a brahma. I wasn't sure at first but am very confident now.
As I said before, I am extremely grateful for everyone's help!

 

[Wyorp Rock]

Just an update if anyone was curious!

Nina and Noel are doing perfectly fine. They're three months old now, make hen-ish clucks, and chase each other around the yard. No illness has poked its head up yet.
Nina is for sure a cochin bantam, and Noel is for sure a brahma. I wasn't sure at first but am very confident now.
As I said before, I am extremely grateful for everyone's help!

Glad to hear they are doing great!
Thank you for the update