Large DWC Setup Question

I've got 2 x 54 gallon rubbermaid totes that im constructing into a DWC. Each one will house 12 6 inch nets in a sog style grow. they will all be kept small to produce just one main cola so virtually no veg time. my question is:

what air pump will be suitable to provide a good amount of bubbles for these totes. if i can run both totes on one pump it would be great! also, what size airstones and how many?

i was thinking going with a commercial pump but i dont know what size. any pointers would be very welcome!

yes i had a similar setup 2 big dwc totes i got an electromagnetic pump similar to this one http://www.horticulturesource.com/hydrofarm-activeaqua-commercial-air-pump-8-outlets-p6350/?osCsid=043864ff2ffe8eb97d8a951b750e53e1 with 6 main outlets each split into 2 totaling 12 airstones. i used the 4" airstones but using the 6" is also possible. the problem with this pump is that it is loud. you can dampen it a little bit but if you care much about stealth, maybe it is better to get several smaller pumps. you cannot put that big pump in a box to dampen it because it heats up needs to be cooled. whatever you chose to get, you need bubbles to be covering the surface area of your tote.