I went to my second reef club tonight. I mentioned to the host that I vacuum my gravel and he gave me look like . He recommended that I stop it immediately. He says that I am pulling out the good stuff and messing up my sand bed. So I am a little puzzled at this point. Should I be vacuuming or not?

A little background info. I have a 3 inch sand bed over a plenum (a water pocket). I don't have any real sand stirrers. I am may purchase a tiger tail soon. The sand I have is larger than southdown, more like salt on large pretzel. I started vacuum at the beginning of the summer. I only vacuum the top inch of sand and only front floor which is probably 1/5 or less of the tank. When I first started the waste water was like chocolate milk color. Now it is pretty minimal. The sand looks a ton better after I vacuum.

Any thoughts???