Built a 600 gallon plywood tank and I have a 3 55 gallon barrel set up for my filtration. First barrel receives the water from the tank and the third has the pump. My old 300 gallon tank I had a drain on each end and a return on each end tuned by a ball valve. Always thought this made sense and would work the best. My new tank will require more flow and was thinking if I ran both returns on the same end I would eliminate alot of head loss. What are your guys thoughts on this, I have not cut any holes yet so I can run the drains or returns anywhere