To add to my disasters...

So today I see the tang and the clowns look like they have cloudy eyes and one of the clowns has something hanging off its fin that looks almost like the start of GHA (don;t really know how else to describe it). Been trying to shoot pics, but no such luck. Eels look normal. The clowns also seem to be "twitching" at random times. Nothing has been introduced into the tank aside from the YT about two weeks ago. The YT was from another member here and came from an established tank that he had it in for 6+ weeks to kill off some GHA in the display. Not sure what to think at this point. Did the sudden salinity drop weaken these guys' systems and cause some sort of break out?