AQQA 6-in-1 Electric Aquarium Gravel Cleaner Kit - 20W 320GPH Fish Tank Vacuum, Water Changer & Sand Filter for Freshwater & Saltwater Tanks - Perfect for Weekly Maintenance and Water Circulation Cleaning

This gravel vac has several configurations and different ways to use it. What I found most useful in my setups are the vacuum and pump attachments. There are some other attachments that would be best suited for a bare bottom tank (which I don’t have).Gravel Vac:The gravel vac worked great on my substrate that is “pea gravel” but I didn’t use it on my sand bedded tanks as the sand grains are too small and would get sucked up into the pump motor. If you have a gravel bed, this should work great for you to do a good vacuuming. There is a sponge inside the vacuum attachment however I found that it worked really well without it. The diameter of my old vac is a bit wider and I found that the Hygger vacuum fit in between rocks, driftwood, etc much better. Also, the bag that the vacuum discharges into tended to fall off after much use but a rubber band held it on great!I also found that the pump attachment was very handy. It allows the handle to sit upright on a small base. I have emptied a 55g and a 29g tank - both extremely quickly and have also used it to speed up water changes. The included hose although long enough to reach a bucket, was not long enough to reach a drain however I found that my manual siphon hose attaches to the Hygger which allows me to reach my drains.A few words of caution...First, when you’re done and remove it from the tank, regardless of which attachment you’re using, be prepared to have a bucket close by to put it in as it will leak water out of it. I hold it above my tank to let it drain and then put it immediately into a bucket.Second, if you’re using this for water changes, remember the pump sits at the BOTTOM of the tank. It’s really easy to empty your tank completely if you’re not paying attention!I’ve used a couple battery operated gravel vacs and I was never happy Witt their power. This one plugs into the wall and is much stronger!Overall, this gravel vac works very well for my purposes in the fish room.