One of my mushrooms has disappeared completely somewhere in my rocks, I would get it to grab hold and stay but then like you said would release and move with the current. I finally gave up and let it hopefully be where it's happy even if I can't see it. I've got a bounce mushroom that will move about 2 inches every 3 days. Again I've tried to get it to attach and set it where I wanted it, it detached and is now laying on my substrate. One day it will be right next to my rock, 3 days later it will be a couple inches away, it moves back & forth. Then I have another two mushrooms that I don't think I could move with a bulldozer off their rocks. Guess mushrooms are like people, you got ones that are loners, the field players (or bar hoppers) and then the ones married for life. :nerd: