Whats your take on pump failure and plant survival time in an aero setup like yours? Do the roots actually sit in that 1/2" of nute solution at the bottm of the 27 gallon or are they suspended above it? This would determine to a large degree how long a plant could go if the power/pump went out. Also if the roots do not sit in the solution rez temps wouldn't be as much of a concern I would assume. This is always my main concern whenever I think about making the switch.
Very nice stuff hydr1.