Pisces Gravel Vacuum Ceaner 12InchFor use in any size aquarium this gravel cleaner allows you to quickly and easily clean dirt and debris that has settled in the gravel in your aquarium. Using a siphon action it picks up all debris and siphons it out of the aquarium while allowing the gravel to resettle in the aquarium. Far more effective than simply stirring the gravel during a water change this method allows you to get a far better clean while changing a minimal amount of water.