One of my Giant Danios has popeye in both eyes. Will he be OK? Will he go blind? Will he lose his eyes? I'm very worried about him.

popeye?

His eyes are bulged. I turned down the bubble bars. Could that have caused it?

Ask a vet?

hmmm....he should be fine.if he starts bouncing off the glass then you should be concerned

9. Other Signs of Stress
There are many other Signs of Stress and Disease in fish. For example, there is so-called "fin rot" where the edges of the fish's fins disintegrate, or "pop eye" where the fish's eye bulges out, or "cotton mouth" where the fish has patches that look like cotton around it's mouth, but most of these more pronounced Signs of Stress and Disease occur after the more subtle Signs of Stress and Disease that are listed above.
"Fin rot", "pop eye", "dropsy", and "cotton mouth" are difficult to cure. But before they occur, the fish often show milder Signs of Stress and Disease like clamped fins. If you treat a fish at the first Sign of Stress and Disease, you'll have a much better chance of curing it.

http://www.aquariumfish.net/information/signs_of_stress_and_disease.htm

treatments

http://www.aquariumfish.net/information/recommended_treatment.htm#top2

The thing is the tank is new, so I can't clean it or add any medicine yet. I did turn the heater up a bit, so hopefully that helps. The temp. is at 74C now.

I've had some Goldfish that have gotten popeye and they usually don't make it. You can go to Petsmart or a store like that and get some meds to put in the water, but its probably too late at this point.

Its not the bubble bars.
Do an immediate partial water change, make sure not to let the water drop below 50 percent. Add aquarium salt 1 tablespoon per 5 gallons. And get some Maracyn-2. Ive never had issues with Maracyn killing the nitrifying bacteria so it should be fine to add.

flush him!

$.02

spinach

I changed about 5 gallons and bumped the temp. up to 76C.It looks like another one might have it as well.

The water change and tempertature bump seemed to help a little. I got some melafix and aquarium salt and put the full recommended dose of melafix in the tank and only half of the recommened amount of salt to error on the safe side. Of course I took the carbon filters out of both filters and just have them running with the bio filters in. Everything seems to be ok now. I hope this works.

Have you tested your water parameters?

I dont know anything about fish but 76c is like 168 degrees farenheit. isnt that enought to cook em?

did you let the tank cycle before you put them in? I used to have the same fish an the pet store told me that you had to let the tank cycle before you put any fish in there.

I meant 76F the C was a typo

I couldn't let it stabilize for 24hours because I only had a 1 gal bowl to keep them in. But, the Melafix and salt seem to be working. I think it was more from stress and trauma than the water. When I put them in the bowl, one jumped out onto the floor, and I think that's the one with popeye now. He's doing much better. He's chasing the other fish around and seems to be feeling much better. The swelling has go done a little as well. His eyes are still pretty swollen though.

Not yet, I need a better test kit.