I wish I knew how to create a survey for all reefers with sand beds. Do you (A) Leave it be (B) Stir it regularly (C) Aggressively vacuum it regularly (D) Utilize cuc such as Sand Sifting Starfish, snails, fish etc. (E) Other. My tank is 18 months old, 5' x 2' with 2" of sand. I have never vacuumed it but have two fat sand sifting stars. I do notice a plume of grey whenever I disturb the sand which concerns me. Nutrient levels are 11/0.1 and I have no algae issues.