I'll do that, hopefully that's all we need! I keep seeing things about MG-is there any way to rule it out over a respiratory thing (if they eye flush doesn't help)
I hope that's all that is needed too. Sometimes they can get a bit of bedding, food, feather, etc. in the eye that causes irritation.
If that's the case, then flushing and cleaning the eye will usually resolve the problem quickly and you won't see any more signs of bubbles in the eyes.
Bubbles in the eyes along with other symptoms like sneezing, coughing, mucous, etc., leans more toward respiratory illness. Bubbles often are associated with MG. But it could also be a virus like Infectious Bronchitis. Without testing, there's no way to know what illness it is really, but most do find that an antibiotic helps, so when that happens, usually it's considered MG since it's a bacteria-like disease instead of a virus.
Since you report he's also sneezing and sitting with his beak open, these are a bit worrisome, but I'd still rinse the eyes, look at the nostrils, make sure they don't have any food or shavings stuck in them. Check inside the beak to see if he's got any shavings in the beak or obstruction, just to rule out some of these things being cause of the symptoms you see...chicks can do some odd things sometimes.