Maybe I'm wrong, but I understood that those PWM connectors in the Aquaero are used to power LEDs (so they can dim/bright the leds via PWM).

If you want to control the pump with PWM, you need to connect it to the PWM fan connector, AC5 only have one of this. You will loose one fan channel, but within it you can control your pump. Only need the PWM and RPM wires of the pump, the +12VC and GND can still be taken from the molex, but you need to connect at least those PWM and RPM pins to the PWM FAN connector and your AQ will take control of the pump.

Jose.

Sorry, I don't know the Laing DDC 1 Plus, so I understood that it could be PWM controlled. My mistake.

Then, I didn't understood either the purpose of cutting the molex and connecting the cables to the AQ PWM connector.

If this pump only have 3 cables, it has to be one for the +V and one for GND (both cables in the molex connector), and one mor for RPM signal. You can conect the RPM signal to any connector that reads RPMs, as the FAN connections in the AQ. But you need power to be supplied to the pump in order to make it run. So you can connect the molex connector to one of your PSU, or you can make together the 3 cables to one connector an plug it into any FAN connector able to supply at least te maximum power required by the pump, so if you want to do this, chek if AQ 5 or your MB is able to supply as much amperage or if you need a Power Adjust 2.

Jose.