I don't have any decent pics of my tank yet, still going through a slight algae film issue going on due to some direct sunlight that was creeping through my shades which I've corrected.
But currenty my LM is about 3" long and I have him in a 10gal tank. I have about 18lbs of live rock situated along the back wall from one end to the other to maximize sandbed space. I have calurpa in the tank along the rockwork and I have a small power filter with surface skimming capability and a 90gph powerhead throttled down on the opposing side of the tank. The recommended sandbed depth is 1 1/2 the length of the spearer. My sand bed is 6" deep and I use a combination of crushed live sand and fine white sand (aka low silicate sandbox sand from Lowes.) I also have a heater, glass top, and a T5 light bar.