Wow. What a story. Aside from anything, that's an impressive amount of evaporation!
And I agree on the fish being relsiliant and often tougher than we give credit. Think of the saying, what doesn't kill you makes you stronger - them that survived are pretty strong fish. Each time another fish was about to die, they were always stronger and survived and extended their lead by beating the others to the extra nutrients. And while I don't believe fish have no memory, I do believe like most life on earth, survival always come first when it needs to - and they'd not turn their nose up at food, any food, if it would mean their survival.
Hardly as impressive, but I have a couple of large normal goldies who started of in a tiny airless tank 6 years ago as babies, and have been through tanks without lighting, or filtration for weeks as a time (don't ask) and over the past years they've been slowly aclimatising to a tropical tank. I suddenly realised one day 3 years ago that the thermometre was reading 27 degrees constantly! I then decided, what the hell, and have converted the tank into a tropical tank, and they're still fine and healthy. (I just have caged off half the tank where the plants live and provide a hide-e-hole for the tropical fish to live or retreat into if they get pestered by the two goldies.