Sickness help

I've owned chickens for approximately 3-4 years now. I had a flock of EEs and gave them away back in September due to their egg production decreasing due to age. I then bought 12 brown sex links and a silky rooster. About 4 days ago, I noticed one of the hens eyes were crusted shut. She also began to make a few sneezing noises and her breathing seemed labored. I treated her eyes with Neosporin and they have not crusted shut since. Yesterday another hen started to not look well . She has not left a next box and sits with her head tucked under a wing. This morning, my rooster had one eye crusted shut. Egg production has almost completely stopped. Up to a few days ago, I was getting 8-9 eggs a day. I've only gotten 1 egg the last two days. I'm assuming it's some type of CRD but after researching here and on the web, I'm really confused as to which one. Any help on treatment would be appreciated.

1) What type of bird , age and weight. BROWN SEX LINK. APPROX. 23-24 WEEKS OLD
2) What is the behavior, exactly. LABORED BREATHING, CRUSTED EYE(S), LACK OF ENERGY
3) How long has the bird been exhibiting symptoms? APPROX. 4 DAYS
4) Are other birds exhibiting the same symptoms? YES
5) Is there any bleeding, injury, broken bones or other sign of trauma. NO
6) What happened, if anything that you know of, that may have caused the situation. UNKNOWN
7) What has the bird been eating and drinking, if at all. FRESH WATER DAILY. TRACTOR SUPPLY DUMOR LAYER FEED
8) How does the poop look? Normal? Bloody? Runny? etc. NORMAL TO A LITTLE RUNNY. NO BLOOD
9) What has been the treatment you have administered so far? SISTER IN LAW RECOMMENDED TERRAMYCIN. HAS BEEN ADMINSTERED FOR 3 DAYS
10 ) What is your intent as far as treatment? For example, do you want to treat completely yourself, or do you need help in stabilizing the bird til you can get to a vet? TREAT SELF
11) If you have a picture of the wound or condition, please post it. It may help.
12) Describe the housing/bedding in use. BLOCK DOG KENNEL CONVERTED TO COOP WITH OUTSIDE RUN