I honestly am not sure on most of the questions you asked lmao! I’m planning on running a Jaebo DCP 5000 return pump which is 855 to 1320 gph. I’m using the factory installed overflow box on the 80gal, but I’m changing the overflow plumbing to a Herbie overflow style, so I’m not sure how much water would drain down on a power loss. I’d imagine it would just be the amount of water above the main drain tube in the overflow which should be less than 5gal (I’m guessing). I have no idea on a skimmer, I have never even owned one so i am guessing on the footprint needed for one.
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