Not sure how many return lines I should have in this tall setup. Had someone say depends on the flow your looking for. Not sure I know what flow I'm looking for. Would I want 4 due to the tall tank? I really have no clue. Thanks.
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Not 100% sure what you mean....if I'm on the right track, one return line is all you "need". Something that will carry anywhere between 220 and 440 GPH of flow....so nothing fancy should be required.
How many powerheads in the tank and where to place them? Maybe that's the next question?![]()
One or two return lines are fine. You dont want to have any on the bottom, though the will drain the tank when the pumps are off.

