Lee,
I just wanted to let you know how much your responses to questions like this can help out others, even if the original poster does not continue to respond to the thread.
A couple of weeks ago my Anthius developed a popeye. As usual I came to your forum, but before posting my own question I did a search on popeye and found this thread. After reading your description above I felt my Anthius truly had popeye and I would just monitor the situation. I went ahead and got the QT running just in case. On day three things were not improving and I made an attempt to catch the fish but it alluded me. Since it was still eating I decided not to take any drastic measures (removing rock from the display) to catch it at that time. By day five the eye started to look less popped and now 2 weeks later you would never know there had been a problem.
I just wanted to thank you once again for your well worded advise. It gave me the info I needed to make decisions concerning this fish and all turned out great!