Back in the days, i was fascinated with Goni ( flower pots corals ) i wasn't able to keep them for more than a few months. Now i have 4 different types growing and doing really well. I would think the health of my collection is due to technology and science and knowledge. Back then we didn't ( at least " I " didn't have a calcium reactor or the knowledge ) or any other sort of equipment to sustain them. Nowadays we have a ton of stuff to keep almost anything alive, every time i look at my reef I'm amazed with all the equipment it take to run / keep my livestock alive. We now have the knowledge on how to care for them , feed them , propagate them etc ..