This is our current brooder set up. We will be moving to something bigger in around a week. I was going to put my weak one in her own brooder but am struggling to find something big enough for the MHP since we don’t have two of the heat lamps. So I picked a big salad clam shell out of recycling and she is inside that within the brooder with her own food and water. I’ve taken her out a few times to dip her beak in electrolyte water today so far. I’ve seen her stand and when I’ve picked her up she still chirped a little but doesn’t fight at all. Most of the time she looks to be sleeping.
I'm so sorry you lost her, don't beat yourself up.
Try to enjoy the other chicks, they need you to care for them.
If possible, I'd try to make a larger space for them now instead of waiting for a week. Chicks grow fast and they will be more comfy having room to rouse about.
Do you have a store like Dollar General,
Walmart, etc., near you? If so, ask if you can have a few boxes that toilet paper or paper towels come in. Dollar General especially will tell you, go for it, they have a box dumpster around the side of the store and you can just pick out big boxes.
I've used paper towel/toilet paper boxes many times for brooders, you can expand as the chicks get bigger, just tape some boxes together to make a corral. For flooring, I put down a good layer of thick black trash bags or plastic. Then place puppy pads down with some shavings on top or you can just use several layers of puppy pads and each day just pull up one puppy pad or whatever is heavily soiled and you've cleaned the brooder
When using a lamp, make sure it's very secure so it doesn't fall and cause a fire. I prefer using a heating pad cave (Mama Heating Pad) or brooder plates.
Keep food/water on the cool side of your brooder. You have rocks in your water station which is very smart, this helps prevent chicks from drowning. Your feeder is good too, it can accommodate several chicks at a time and is designed to help lessen feed waste.
Overall, your brooder looks good, just a bit cramped, so having some more room will be helpful.