Thanks Tom,
Actually, and I may be mistaken, but I believe in my situation the sump elevation could be more critical. I have an almost 30' run plus some 90s from my display to my fish room, and my fish room is the same elevation. With this in mind, If I only position the sump water level lets say 12"s below the display water level, I'm not certain that will provide me the 1000gph+ I'm shootin for through the sump with 2, 1" drains which are manifolded together into a 2" line to my fish room. It may take more head pressure to get the desired flow... Any thoughts on this? After I drill the tank, I was planning on pre-setting up the tank in the hanger with an actual 30' run of pipe to experiment, because I really don't have a clue how the flow will be.....Tenecor said, "oh you can count on 600gph for each 1" drain".. but at what kind of head pressure? They are assuming most drains run to a sump under the tank with plenty of head pressure. I've worked the calculators a few times and it says I'll have 7' of head for the return, but this doesn't help me with the drain flow....I went with the 2" lines to the fish room hoping the extra capacity would solve any flow issues I might run up against due to the long run from display to sump..
Jack