I have nova extreme pro lights, I have a small maxima, about 3" wide. I just purchased it the other day. I put him in the sand till I could find a good rock to put him on, my tank is 24" deep. When I checked on it today he was opened up and when I tried to move it, it seemed like it had its foot planted pretty well in the sand. Does that mean it is happy where it is? I am trying to see if there is somewhere on the rock to put it, but if it is fine where it is then I do not want to move it.