Anemones are fun.
They do unexpected and occasionally stupid things, like trying to explore the pump intake with their tentacles. One of the anemones in the photo survived the HOT Magnum, chiefly because I got home and unplugged it, then let the anemone spend 3 days removing its own tentacles. They climb the walls and prevent decent water changes. They flush themselves out and scare you to death. And they are marvelous indicators for the condition of your reef tank.