2 seconds is very long, is the pump blowing out bubbles? On a 3ft tank the timing to produce a wave is near .30 seconds, on a 6ft, near .70 seconds. I would make sure the pump is correctly assembled, the most common issue is that the front half has separated from the pump. Besides that, the very long interval would likely mean it is drawing in air and that will also result in a lot of noise. Each tank has one exact time which will produce a wave and it is typically quite fast, the controller should be in wavemode and not pulse mode if it is a 7092.