wow that's cool if u can run 2 tanks off 1 unit..I know nothing about this but i think if u got all the stuff just try it out for a mon or so..if it works out bad a## if not buy the other head unit....
That's if u don't get any feel back on this..Never hear any 1 or see them doing this..But Im sure some 1 is..lol
Good Luck..