You cannot drive a quadro's fan ports from an aquaero's fan ports.
It is possible to slave a quadro to an aquaero, but only up to 2.
If you have an aquaero, you could use 1 PWM port to control both pumps, and hang a
splitty9 active on each of the other 3 PWM ports.
The splitty9 active has a separate power input for the fan's 12V, and can handle 4.5 amps total (8 x 0.5 = 4 amp draw).
This way you could drive 8 fans (both sides of a radiator) from each aquaero PWM port.