First time with sickness.... Sneezing & Congestion... How do I treat? Do I treat them all?

[NeedToKnowItAll]

Video link on reddit of chick Tuesday night at end of post (couldnt upload here):

1 week 4 day old chick (we think silkie) started sneezing Tuesday night. We've had her since day one and she's been healthy, energetic, eating and drinking. 4pm Tuesday I did my normal pasty butt check and she had no signs of congestion or sneezing. 10pm Tuesday she sneezed and I immediately quarantined her in her own brooder. I did ALOT of asking around and people that I know have experience told me to give Electrolytes and switch to medicated feed, give a little sugar water and to start Corid treatment on her and all the other chicks we have. She was originally in the brooder with 3 other chicks we got at the same time as her. 2 Easter Eggers that were with her have no sign of congestion but third chick, which is another bantam has just a little crackling in her chest while breathing, so I also quarantined her with the first one today. The rest of the chicks we have are (8) Wyandottes 3 weeks old, (7) Buff Orpington 5 weeks old, and (5) White Leghorns 7 weeks old. We just moved the White Leghorns to the coop today and I also started the Corid treatment today on all BUT the white leghorns and switched everyone to medicated feed. It was a hectic afternoon and I just forgot to give the White Leghorns the Corid water when putting them in the coop. All of the breeds are in seperate brooders bc we got them at different times and I wanted to be safe. The brooders are set up on our covered, screened in sunroom/porch with each at the appropriate temperatures for their age using heat lamps but the outside weather is what they are in (I hope I'm making sense). The brooders are set up about 3 - 4 feet apart. The white leghorns and Buff orpingtons mingle when they go outside on "field trips" but the Wyandottes and the Easter Egger/Bantam crew havent mingled at all with any of the others. I do go from brooder to brooder though so that's where my concern comes in for the others. The two that have congestion (silkie and unknown bantam) are eating, drinking, active, and have great "poops" just congestion and sneezing with the silkie. The temperature did drop alot this week so could it just be a cold? Am I doing the right thing by treating them all with Corid? Is it going to hurt the "healthy" chicks by treating them as well with no symptoms? What would you have done in this situation? Am I doing too much? If you can't tell I'm new to this and want the best for them all. I'm also a huge overthinker and grateful I found this group/site! TIA!!

Video of chick Tuesday Night

 

[Chicken lover1980]

so so far so good, you have everyone separated right? to make sure nothing contagious spreads try to start with the healthy ones and finish with the sick ones last.

corid isn't used to treat respiratory infections or sickness, and sneezing and crackly breathing is a sign of respiratory distress.

it could have been the cold weather that caused them to get sick. how are they doing now?

also have you tried putting a little bit of ACV in their water?

 

[NeedToKnowItAll]

so so far so good, you have everyone separated right? to make sure nothing contagious spreads try to start with the healthy ones and finish with the sick ones last.

corid isn't used to treat respiratory infections or sickness, and sneezing and crackly breathing is a sign of respiratory distress.

it could have been the cold weather that caused them to get sick. how are they doing now?

also have you tried putting a little bit of ACV in their water?

Everyone is healthy and thriving it seems. I do still have them all seperated though. I've noticed a sneeze here and there but I think that's normal. No congestion or crackling anymore. Silkie and unknown bantam are the tiniest of the crew so I want to say the weather change was the cause. It just hit them harder being so small im assuming. We moved the two tiny ones indoors until two days ago and they got rid of the congestion and now two days back on our porch/sunroom seem to be doing amazing. I didn't try the ACV in the water but I will definitely try it next time if there is a next time. Do you add it during times of sickness or is any time ok periodically? Thanks for responding!!