We had lowered them to increase PAR but with these new strips we can probably get away with having them higher. Less likely to get splashed and more clearance to work in the tank. Things in general seem pretty happy with the way they are positioned now. We have the 4 evenly spaced as much as possible currently. The tank has a center brace across the top.I'm not sure highly you think of BRS but they recommend the Hydras 26 to be mounted 14" above the water line for the best light spread.