I have a build thread under nano tanks and Im also making a post of my question here so maybe it will get more views. I just set up my nano cube the other day with liverock from LFS and I have the orange thing inside of a piece of rock. It seems to just move in and out a bit and will snap back in the rock then the light turns on. Thanks!
Here is a picture with it out a bit
Here it is after it snapped back inside the rock
Here is a picture with it out a bit
Here it is after it snapped back inside the rock