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Great question with a variety of ideas on whether to disrupt it or not. I have a 120 gallons mixed reef (9 years mature) with predominantly SPS. I have conch’s along with other sand stirring creatures but I weekly just run my gloves finger or take a turkey baster and fluff the sand as I like to call it. My parameters are fine and there never has been an ammonia or nitrate spike post fluffing. I double the dose of micro bacter 7 (50 ml’s twice a week) to ensure there is an appropriate level of bacteria to metabolize the bad stuff. This is a reef right and reefs undergo a lot of tidal currents that churn the sand bed constantly. So I continued with that philosophy and have never let my substrate bed sit for more than two weeks. The corraline growth below the sand bed is ridiculous and seems to work. Just my experience.How often do you clean the sand bed?