If chicks are pooping blood, it is not good. Plain and simple. They need to be treated. I highly doubt that the move made them have internal bleeding.
You need to undertand that you can lose chicks
very quickly from Coccidiosis, which is common in chicks and is one of the only causes of blood in the stool. Even traces of blood are early warnings of Cocci and they need to be treated,
at least to be sure.
Im not trying to be mean, but I dont want you to end up in the heartbraking situation like I did.
Just the other day, I bought a new bag of chick food and it was a different brand, I didnt know it wasnt medicated. Within 4 or 5 days after taking them off of the medicated food, I noticed 2 were lethargic, they werent in an area I could monitor droppings (big mistake). When I moved them, I noticed they were pooping blood severely, almost completely straight blood. I immediately put them on Sulmet, but while I was doing that, 2 died right in front of me after dripping blood. I was so devestated.
The rest were pooping straight blood, but they were not quite as bad, and I was able to get them back with some Sulmet, egg to provide a source of vit B (for red blood cell production), electrolyte water, and Pepto. It took a few days, and I thought I was going to lose them, but it worked.
Dont let them get that far! Get your babies treated and them get them on medicated food! Give them some hardboiled egg too. They are little bodies and will lose vitality quickly when bleeding! Theres no time to lose...learn from my mistake!
Even if they dont have Cocci, it doesnt hurt at all to treat them for it.