Need some help figuring out fan/radiator/pump wiring please

Hi All,

I am moving along nicely in my build and have come to an area that I dont feel entirely sure about. Hoping that you can offer some guidance.

I am using a Phanteks Enthoo Evolv case, and Asus Maximus Code motherboard, and an EKWB x360 Water Cooling Kit.

The back of the case has a PWM fan hub. On that hub, one of the inputs is labeled CPU_Fan. This has a cable going from it to the motherboard CPU_Fan input.

The fan hub has the case fans plugged into it as well as a 12V power cable.

Now I installed the radiator and the three fans on the radiator are connected via a 3 way splitter into one 4pin cable. The instructions state to connect to the CPU_Fan. But as previously stated the CPU FAN input on the mobo and on the hub are occupied.

The mobo has some other fan inputs on it that are available such as CPu_Opt and then some cooling specific inputs such as AIO_Pump and Water Flow + and some others.

Just not sure where to go with the radiator fans at this point.

Thanks for any advice you can offer.