Hollister, you are flat out wrong in your idea that nitrates will somehow gas off. Nitrate is not a gas, its a salt. The lid thing makes no sense either. A sump and protein skimmer will offer plenty of gas exchange and having a lid isn't as big a factor on the suface gas exchange as having some surface movement from good water flow.
Minimum LR, high flow, this is a bad recipe for nitrate reduction. You need low flow and lots of rock for low oxygen zones to develop. You need to go back and study that link you posted.