Join Date: Sep 2009
Location: Collinsville, IL (by St. Louis)
I just built 2 for each of my 55 gallons out of 1/2 PVC for my 405. I basically put it in the same spot you are looking at. I put about 5 holes equally spread out spraying across and 3 spraying straight down to eliminate dead spots below the bar. I started with small holes, tested, drilled bigger holes, tested, rinse and repeat. I did this til I was happy with the flow.