Marineland/Aquaria Siphon Kleen is 6 feet of hose that helps to remove accumulated waste in your fish tank, leaving the gravel bed open to oxygenated water flow and increased aerobic bacterial action. Specially-designed angle-cut end grabs more grunge, leaving gravel behind. Ideal for aquariums of up to 10 gallons. Mini- 1" x 12-1/4" For small aquariums & Hard to Reach Places. Medium- 1-5/8" x 11-1/2" For aquariums up to 20 gallons. Large- 1-7/8" x 14-1/4" For aquariums over 20 gallons. X-Large- 1-7/8"x 24" For all deep aquariums.