"Like heaters, Gravel siphons are harder to find for small tanks! This Siphon is perfect for small tanks since it is small and doesn't take out too much water at a time. I use it for my 6 gallon and 1.5 gallon tanks. And yes it is even easy to start in a 1.5 gallon tank. If you have a tank bigger then 10-20 gallons I would recomend one of their bigger model siphons."