Does Asus provide software to control onboard fans? My guess is yes but I haven't bought an Asus board in a long long time. You can use that to set a specify the RPM of the pump or a fan curve which sets RPM based on a temperature sensor (CPU temp for example). You should be able to do all this in the BIOS as well.
For example, I've attached a screenshot of what my pump curve looks like. I keep it at a quiet RPM until it hits 60C, then it rapidly spikes up.