I have 3 d5 pumps with aquabus and a splitty 9. I want to be able to hook 3 pumps to aquabus. How many pumps can a Aquaero have hooked up to it at one time? Does the Aquabus provide power to the pumps or do you still need to hook up the power via molex cable? In what situation would one need to buy a poweradjust 3 or ultra?