6015, 6025, 6045 are not controllable, they just plug in and go. You can switch them off and on as often as once every 15 minutes. A simple set up would be 2 6025 or 2 6045 and a pair of timers and running them off and on every hour with about 5-10 minutes of overlap to produce a surge. The 6045 is mechanically adjustable and the extra flow is likely a benefit once the SPS grow in.
A deluxe set up would be 2 6055 and a 7092 or 7096 controller.