Vacuuming your Fluval substrate is one of the most important steps in keeping your aquarium healthy. To properly vacuum the substrate, it’s best to start with a siphon-style gravel vac. When using this type of vacuum, make sure to keep the intake at least an inch away from the bottom of your tank so you don’t suck up too much debris from the substrate. Begin by slowly dragging the hose along different sections of your tank and watch as debris is removed from around plants and other decorations. As you move further into your aquarium, aim for deeper areas where waste tends to accumulate more quickly. Then continue moving back out towards shallower areas until all dirt has been removed from each section of the tank floor. Remember to be gentle when working around decorations like driftwood or rocks since they can easily be damaged if moved too forcefully with a vacuum cleaner. After finishing vacuuming, take care not to disturb any newly laid eggs or fry in case there are any present in your tank! With regular maintenance and careful attention while cleaning, you should have no problem maintaining crystal clear water quality within your Fluval aquarium setup!