Trisseh
Duck-duck-chicken!
I would stick with amoxicillin for now... you can get some weird side effects with metronidazole, neuro stuff that you don’t need on top of the rest of what’s going on with this little one. 

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good way to get extra water into him too, without too much effort on his part. I’ve used Oxbow critical care for birds before, it’s nice because it’s higher calorie so less of it goes further and can be made to whatever consistency you need.

You can give him 57 mg per pound of amoxicillin twice a day for 7 days. I would apply a dab of plain antibiotic ointment into his eye to keep it from sealing itself again. When I have a sick chicken needing to eat and drink, I will mix some very watery chick feed, a few bits of scrambled egg, tuna, or canned cat food. Add water to each. Then I sprinkle on some dry feed a little at a time to stimulate them to peck at it. Do this at least twice a day.