The Jebao SLW-20 is the latest pump from jebao. It has a super compact profile. The pump protrudes only 2.25" into your aquarium, and has a diameter of 2.75". Every pump has a maximum output of 2,500gph. These work best in smaller to medium aquariums from 20 to 100 gallons. Every pump includes a sine wave controller with multiple wave modes, including short pulse, since wave pulse, random, and constant operation. The controllers can be linked wirelessly for a master/slave setup. There is an integrated light sensor and 10 minute feed timer built in. 12 month warranty.