Your right, it's dark. I think I got it though. Each side has a feed pipe and a return pipe, for a total of two each?
What is the inside diameter of the returns/feeds?
If you got the sump from the same friend that sold you the tank, assuming they were connected at some point, and assuming everything worked lol, doesn't he have the pieces to reconnect?
If not, considering head loss, if you decide to go with one pump and tee it, you should center the return pump on the tank. Wherever that puts the sump is what you have to work with for the feed pipe tees. (You might consider soft plumbing).
2000gph is way too much IMO for three reasons. 1. Your sump feeds do not appear capable. 2. Shoving water into a 75 sump at a rate of 33gpm is not doing your bio any favors. And 3. 2000gph is a ~12x turn over rate, which is twice the amount that is realistically required.
The main function of the sump is bio, which requires a balanced dwell time, meaning the water needs to trickle through the media in order sustain a good bio load and allow the bio to do its work. If you use good bio media like matrix or pond matrix (along with a ton of pot scrubbies just because you have the room) and it has time to do its work, you don't need to turn the tank over a dozen times per hour.
Still need to see the sump design though.
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