I think your mama and my mama went to the same school! lol
I do not have another place I can "tank" my Discus but I know they can handle a black out and go without food, no problem. Knock wood, they are a healthy bunch.
I think the thing that is the most frustrating, BEYOND the most frustrating, is that all my tanks are planted, maintained and feed the same, lighting schedules, etc., everything is the same! Why the heck am I having problems with this one!! Why couldn't it have been one of the littler ones?? Waaa Waaa Waaa. Ok, I'll stop crying now.
"Murphy's Law." I am truly pained for you. Those are amazing looking fish. I wouldn't want to go 3-4 days without looking at them. :-( I really hope everything goes great with your tank in the future. It's just "one of those things"...as mama would say.