so come home today can't see the Flame. Finally can get little glimpses of him deep in the rock work and looks like one eye is swollen. Fed the tank and he's still not coming out.

Could fighting cause something like pop-eye?

The fight probably resulted in the flame angel running into a rock. How is it doing?

Pop-eye is a disease that usually affects both eyes..... If it's just one eye then chances are, that it is just scratched, like PR said....

FA is still hiding but the eye (only problem with one) is still swollen but appears going down.

My purple and PB tangs were picking on my mimic tang when I first got him, after a few days I noticed his one eye was swollen. After a few more days everyone settled down and the mimic's eye went back to normal.

good to know

I was also told when introducing like species that could have issues 2 thing you can do if you are able that kinda reset or calm things down.

Rework the rock work a bit then no one owns one spot and everyone is finding their space again.
Also, a 24 hours lights out period. Not sure of the advantage, but it worked for when I had a coral beauty and a rusty angel. They got along splendidly.

As for the hiding, the foxface I had did that with my tang for awhile until they realised that the tank is big enough for the both of them, and they are still both going to get fed. For awhile there was a battle, foxface would dive attack tang with its venom fins, and the tang would slash at him with his tail barb. But after awhile they realised it wasnt getting them anywhere and they got along just fine.

Flame is looking better, eye nearly healed. Not a tank cruiser but then neither is the Coral Beauty and he's had a year plus to adjust to the tank.