I have a little reef conversion story. I was running a reef tank at home (Vermont) in 2011, and then I got flooded out by Irene, killing my whole tank. I had another tank at my folks house, but I ended up breaking it down while dealing with everything. I saved all the coral, and left it outside after cleaning everything off and saying goodbye to the hobby.
Seven years later, I started a planted tank because I wanted to host an ecosystem again. A few months in, I was visiting my parents and spotted the coral I had left outside, which was now covered in moss. I now have one of those corals in my planted tank with the moss still going. It is the middle moss on the wood, which is actually from my teenage tank from the 1990s. I probably have another dozen moss-covered rocks and corals from those old tanks outside.