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I am in the habit of cleaning my goldfish tank weekly and wanted to stay on the same schedule with Gizmos 5 gallon tank. My question is about cleaning the gravel. I have two gravel cleaners but both are pretty large for cleaning the 20 gallon tank. I couldn't keep them on an angle and maneuver them are a small tank. What do most of you use to clean the gravel in your small tanks and do you leave your betta in the tank while you do it or relocate them to another place while your working in the tank?