My haddoni has been in the same plastic container for about the past 6 months. It was ill from hypothermia when I placed it there. Now it's healed and back to its old self. I believe Traveler7 has had great success with this technique as well.
I also have two LTA's. They will attach when they don't have sand, but they will not sit still. They will sometimes even let go and let the flow take them somewhere else where they reattach. Over time they begin to shrink. I believe it's because of all the extra energy they are spending. When they have sand, and the other conditions are right, they don't move.