I don't that is the sand bed he is talking about - but it's unclear - I agree with you - a little sand - even with a little glass. I do not believe that a 'thick sand bed - lets say an inch or more is either beneficial or necessary - unless you have fish that require sandSand bed, and I always will be. I have done all the variations of sand bed that I can think of and between you and me, I like what I have right now the most. I have about 1cm of sand throughout the tank with some areas as shallow as a few grains of sand. Rarely see the glass though.