I want to use the wavemaker feature on my reefkeeper elite. The problem I have is that I need some feedback on what powerheads are best suited for this. I would prefer they do not clack everytime they turn on. I am also unsure on what duty cycle they are designed to handle. I would imagine that the start-up and shutdown would cause extra wear and tear on them. The controllable hydor models seem like they use a DC motor which is controlled through the Hydor controller....they claim variable flow so this makes me think they are DC motors. That is unless they are using some sort of variable frequency drive (VFD) on AC motors. Any advice is appreciated.