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I really don't vac the gravel but as my Python drains water during a WC I'll gently poke the bell around the bottom of the plants where I can. I hold the bell just above the substrate and wiggle it gently. It's surprising how much detritus is holding at the bottom of the plants just above the surface. Even in a 29g with an Fluval C3 HOB and a Fluval 206 canister. OS.