I just got my tank filled and finally started a cycle for the most part. This is a closed loop system with four return bulkheads in it. Two are up high near opposite ends of the tank and the other two are about half way up the tank and a quarter ways in, one on each side. I wanted to find out how I can direct the flow of each bulkhead so I can maybe them in directions that I want them. Is loc-line what I would use for this? The inside of my bulkheads are slip fittings, obviously I won't be able to glue the fittings inside but is it possible to somehow attach the fittings while still in water?