[Aquattro]

Thanks Tony. My design allows for the surge box to sit in the stand at tank level. I think I can keep the output flooded to avoid air. I think the bubbles might cause a fair amount of salt spray on the lights in short order...thoughts?
I'm also considering a closed-loop plumbed thru the side instead of the surge box. I would also have about 4 gallons going in. Do you think this is a sufficient amount, given the work involved? Or perhaps the closed loop would give better returns for the effort.
What is the length of your tank? Does 4 gallons travel most of this length? My tank is 5 ft. and I can only put a surge on one end. DO you think it will surge more thatn half way across the tank?