An Aquaero 6 can supply enough power from a channel to power all but the most ludicrous of pumps (30W if memory serves correctly).
You'll probably find that the pump is wired assuming that whatever you plug the 4-pin fan cable into cannot provide that amount of power. The usual is to take power from the molex and provide sense (rpm readout) and maybe control (PWM) on the fan header. Count how many wires you have on the 4-pin plug. You can probably re-wire it if you can crimp fan pins on and shove them in the empty slots in the fan plug (wires in the appropriate places, naturally). There is a product that does this for you but it's aimed at 3-pin fan header. For reference, that is https://www.overclockers.co.uk/aqua...dc-poweradjust-2-aquaero-5.6-wc-277-aq.html
You'll probably find that the pump is wired assuming that whatever you plug the 4-pin fan cable into cannot provide that amount of power. The usual is to take power from the molex and provide sense (rpm readout) and maybe control (PWM) on the fan header. Count how many wires you have on the 4-pin plug. You can probably re-wire it if you can crimp fan pins on and shove them in the empty slots in the fan plug (wires in the appropriate places, naturally). There is a product that does this for you but it's aimed at 3-pin fan header. For reference, that is https://www.overclockers.co.uk/aqua...dc-poweradjust-2-aquaero-5.6-wc-277-aq.html