Well it turns out I'm not getting the Fluval SP4 after all.
The purchase didn't go thru. Maybe that's more than a coincidence, lol
)
Anyhow, back searching for a controllable pump now. In particular the Reef octopus vario 6, but not 100% yet. None available I could find currently...
I do like the idea of controllable, yet quiet. Thx for the tips😊