I have a Vortech(gen 1) and I would definitely say it works very well. In a 4ft tank a single mp40 will do very well, anything longer will really need a 2nd one though. My tank is 72 x 18 x 29 and I have one vortech and a single K3 at the other end to compensate for the vortech's lack of reach. Using a G2 vortech in one of the pulse modes would probably be sufficient in a 6ft tank . I will be upgrading the driver for mine and I will report back in a few weeks.