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The gravel vacuum is the most misused tool in the hobby — most people drain half the tank onto the floor, blast the substrate into a dust storm, or suck out the one thing their plants were living on. In this video I show you five hacks to gravel vacuum a fish tank properly, the Japanese way: how to start the siphon without ever putting your mouth on it, how to lift the waste while the gravel drops back, how to clean sand without losing it, and — counting down to the one that matters most — the planted-tank secret that tells you when to stop cleaning. Because in a proper planted tank, the dark gunk in the substrate is not filth. It is free fertilizer your fish made for you.

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