I would imagine, as at that point there is no active power in the system. However I've been too lazy to install the aquero sitting in my closet the last few months so i wish i could be more help for you.
It depends entirely on your motherboard sleep settings and what stage of sleep it goes to. The state you're seeing is one where the motherboard powers down the PSU. There is a different sleep state where the motherboard does not power down the PSU, which keeps pumps and fans running.