It will work, however the shorter and wider the tank, the shorter the wave height and it will also be faster, they work fairly well in a 4ft tank but wave will be not more than 3/4" and fairly fast. In general it should always be used with pumps, the wave has no direction and just rocks back and forth, it lifts and suspends debris, food, etc, but you want directional current from powerheads to move it to the filter.