I'm still worried about the whole stressing-thing, as stupid as it may sound to most people.
Fish are very sensitive.
My tang had weird stuff going in for the first week in the new tank after being in QT for several weeks. Don't know if the way-too-small-for-tang QT did it, or the transfer to new tank, but he was peeling, had HLLE
even with balanced food, and his fins were getting "moldy". Now he is happy and healthy, thinking he owns the entire 120g LOL Every sign of sickness disappeared and none of the other fish got anything. I didnt do anything to "fix" him, just time, peace and quiet (and a good healthy diet).
Don't know if this story helps any, prolly not LOL, but sometimes it's just better to not do too much.
Changing tanks, chasing with nets etc has a big impact in a fish...
Sorry, in just trying to help