wowy ka-zowy!
Robert,
Beautiful tank, but I have a question. You state your tank is 720 gallons, but a 110" x 40" x 27" tank is 514 gallons. Is your 720 gallons figure including your sump volume? Reason I noticed is because my tank is a lot like yours at L96" x W40" x H28", and has a volume of 465 gallons. I even have the clear area behind the reef structure like you, as well as being bare bottom.