In my experience, it does not spread among healthy fish. I have had some thought that it may be linled to stress (primarily social stress, as you have encounteres) and I am now beginning to think that there may be a point of no return. The trout pictured in my thread is now the alpha of the tank, but he was a subordinate for a long time after the eye issue began. I haven't seen the eye issue clear in any amount of time in my trout, although it has come and gone more than once in my angel fish. My thinking is that if your fish continues to be stressed, the condition will persist. I am also fully open to the thought that I am completely wrong...
