Can you supply CO2 to more then one aquarium with the V2/3 style of regulator?
You can supply both tanks with co2, but you won't be able to adjust their distribution independently. There is only 1 knob on the regulator.
But I am 90% sure you can do multiple tanks with some of their other setups.
For what it's worth, I really do think GLA's atomic regulators are the sexiest around! Can't go wrong with it.