I agree this sounds like typical Coryza. They do become carriers thereafter so you'll want to keep them seperate or as only-birds as Coryza is quite contagious.
If you wish to treat it, Coryza is susceptible to Sulmet, or to a combination of Duramycin and Aureomycin. You should clean their discharges daily with sterile saline wash. You can do a sinus and eye-sinus flush with Tylan50 injectable to help. (PM me for instructions.) They must be treated for the absolute FULL course of the antibiotics, not a day less. Being carriers, they are susceptible to relapse. The disease is not vertically transmitted (via egg) but is horizontally (via contact, or 'fomite' including your shoes, clothes, etc - even taking the germs to the feed store when you go.)
You'll also want to give them vitamins daily... polyvisol twice a day via beak.
And probiotics daily - one capsule acidophilis or some Probios powder or paste daily. You can NOT use milk products or yogurt if you treat with the mycins. But you MUST use a probiotic (liver bacteria) to replace those they'll lose being treated for the nearly 14 days on the mycins, or 7-10 days on the Sulmet.
VetRx is also quite helpful for reducing the congestion, inflammation, and mucus. Mix a few drops of VetRx with an equal number of drops of very very hot water in a cup. Stir. Use q-tips to clean their nostrils, press into the opening in the roof of their beaks, and under each eye. Use a new q-tip end for each spot, a brand new q-tip when you switch birds.
It's possible you could take these babies to a vet, but I would still at the very LEAST recommend that you do the above listed non-medicinal support (yogurt, vitamins, VetRx). the vet trip will be a waste of money if they don't do a "culture and sensitivity", and they rarely volunteer to do one. So you have to ask for it. that will tell you exactly which bacteria it is and exactly which antibiotic to use. You must use an avian vet for this case if you use one.
