Please, any help is greatly appreciated, as I'm fairly new to owning chickens and never experienced any illnesses before. I bought 3 chicks and 1 juvenile four days ago. I made the mistake of feeling bad for one of the smaller chicks that appeared to be getting trampled frequently. I didn't realize it was sick until I got home. Individual details below. GOLDLACED TOLBUNT SPLIT FRIZZLE: (Trampled sick chick) Unsure of age, the owner couldn't remember. She guessed 5-6 weeks. When I got home it was evident that it was extremely sick. Lethargic, wouldn't open eyes, refused to eat or drink. I originally isolated it, but they were all in the same pen where I bought them from and it appeared cold and I didn't have an extra heat source so I put it back in with the other chicks. I stayed up all night hand syringing sugar water. Never helped. Did some research and bought Corid, electrolytes, and Tylan. I put save a chick electrolytes and 1.5 teaspoons of Corid in a gallon of water. Hand syringed treated water the rest of the day and woke up to a moving, eating, and drinking chick. I read later that you shouldn't put electrolytes with corid so discontinued it. So we're on day 3 of Corid and the chick seems to be improving more each day. However, two days ago I noticed it was breathing very heavy, tail bobbing with each breath while awake or asleep. No audible noise, runny nose, or sneezing. I tried listening to it's breathing and I thought I heard a crackling noise but not sure if it was making the noise with its beak or not. Today, I gave 0.2 ml of Tylan 50 orally (I don't have syringes and don't feel comfortable doing IM- chick seems very thin and small). Poop seems normal, eating, drinking, has energy, no evidence of mites, lice, or anything like that. Just the respiratory issue right now. PAINT SILKIE (1 of 2): She remembered that the paints hatched at the same time and knew the date, so they're 6.5 weeks old as of today. Appeared healthy at first. A couple days later my husband and I noticed that it would stop and close it's eyes very frequently. Seems to keep up with everyone else. I've seen it eat and drink but not sure if its a healthy amount or not, I wasn't really paying close attention since I was working on the original sick chick so much. Normal poop from what I can tell. Today a couple new things- I just learned about their crops... I've tried feeling all their crops several times and I'm not really sure what i'm feeling honestly, but only this particular chick I'm thinking I feel something hard. I'm not confident, but I'm feeling around the right side and seems like there is a round hard spot about the size of a marble I smelled around beak and didn't notice anything... got pecked in the nose though lol. I don't know how to treat an impacted crop yet, I don't want to do too much at once. Today it also started sneezing and a couple times I thought it was breathing a bit harder than normal so I gave 0.3 ml of Tylan orally. Tried listening to lungs, and same with the first chick, thought I heard a slight crackling noise but not sure if it was purposely making that noise. Still closing eyes frequently. I saw it eat and drink a little, but again I didn't have a lot of time to watch all of them, so I gave watermelon and they all ate it like crazy. Poop today seemed normal to the best of my knowledge. Also drinking the same water with Corid in it. No evidence of mites, lice, or anything like that. Size is okay.. maybe a little on the thinner side. PAINT SILKIE (2 of 2): Same age as the first silkie, 6.5 weeks old as of today. Good size and weight. Seemed perfectly healthy until today. It was a nice day so I made them a little temporary run (I have other healthy chicks from somewhere else that never came in contact with these chicks and haven't been handled at all since they arrived. I'm the only one tending to their food/water/cleaning- lots of hand washing and wearing gloves). Anyways, I noticed immediately a few spots of bloody poop. Appeared watery thin, maybe a slightest color of brown to it. My husband came over to tell me something and he noticed it right away and asked which one is bleeding. Seemed like I watched them forever and never witnessed a single chicken poop, but this chick was the only one who had a blood tinge butt. I didn't read about intestinal lining poop until later and I really don't know what to think now. Has been drinking the same Corid water. I'll check in the morning and keeping my fingers crossed for no blood. Like the other silkie, this one also started sneezing as well, so I gave 0.3 ml of Tylan orally like the others. Breathing seemed normal. No nasal discharge. Didn't hear anything when I listened to it's lungs. Thought I felt grain in crop earlier today day, later I thought it felt squishy (maybe the watermelon). Seems alert and normal besides the bloody poop and sneezing. JUVENILE BLACK FRIZZLED SILKIE: Age unknown, the lady told me she found it outside with its mama and didn't know she had a hidden nest. Much larger than the others and is very caring for the other 3 chicks. Appears to be mothering them so I'm leaning towards a pullet. When I bought the chicks this one was in a separate pen and I really wish I kept this one separated if anything. We all love this one. Seems very healthy, except for today... like everyone else (except the original sick chick who is only heavy breathing/tail bobbing) started sneezing. Gave 0.4 or 0.5 ml Tylan orally. I tried feeling its crop more times than I'd like to admit and I don't feel anything. Might be the frizzle feathers throwing me off. That's really it for this one so far. I've been in contact with the person who sold me the chickens since day 1. This is long enough already, so I'm not going to get into that. I didn't see the red flags at first, I've learned my lesson, but I'm invested already and willing to do what I can to an extent. According to her, all of her chickens are completely healthy to date... very doubtful on that. I'm fairly certain nobody local to me vets chickens, and even if they did, I don't want to put that kind of money into them. If anyone can help at all, any insight, really anything at all I would greatly appreciate it. Thanks!!!