Tropaquatics Mini-Gravel Vacuum is ideal for use with small aquariums up to 2.5 gallons. Utilizing the 3 inch long, self priming vacuum tube with safety screen design and 18 inch flexible drain hose, you can easily, quickly and regularly clean your small fish bowl or aquarium, in place, by removing waste and debris without disturbing your aquatic pets, plants, decorations or gravel. When you are finished vacuuming your fish bowl, stop the suction by simply lifting the vacuum tube out of the water and replace water with fresh, treated water for use in aquariums.