I have a couple of Tunze 6025's. They are quiet, have decent flow, and have been trouble free. IIRC, Tunze says you can have them on a wavemaker, but shouldn't have the on/off interval be shorter then 30 mins. They will also click when started.
Isn't that RK control module for the controllable Tunze pumps? The 6015, 6025 and 6045 are non-controllable on/off pumps. The more expensive 6055, 6105, etc are controllable and can be ramped up and down.