It just looks cloudy up on top of the tank. Milky. We moved the tank from our old apartment to the new one and when it was drained we made the switch from CC to LS. It is about 3 1/2 to 4 inches thick. I put the sand on the bottom of the tank and then put in the live rock and added the water from the aparment before we moved it. Hope this all makes sense and I didn't mess up the tank too bad.