I never vacuum the sand. I have plenty of nassarius snails and a fighting conch.I'm curious have most wrasse owners stopped vacuuming their sandbeds? I've recently added 3 wrasses and I'll probably add 3 more. I don't have issues with either phosphates or nitrates so I'm considering just adding a sandsifting star to my CUC. The more I read on wrassses the more I believe my glass lid should never come off. The main reason I remove the top is to vacuum during water changes. Think I'll just siphon off 10 gallons and replace and see.