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Should it not function like the box on the link? the section on the right in the top image is the drain section (with a hole drilled on top to manage air)... https://sites.google.com/site/thefishtankjoint/understanding-overflow-boxes

really the same idea as what you posted, but adding skimming the surface, and the line connecting the siphon to the tank inlet to help re-start the siphon

75 gallon.. what is an auto top off?

IDK if this will work. The PVC with holes cut will need to be below the water line to hold the siphon, which will not skim the surface. Even if you only have it an inch or so below the water line, the surface agitation may cause the holes to suck some air and break the siphon. The PVC with the...

Hello all! I am running a 75 gallon fish only (for the time being) tank, with no overflow. I really want the benefit of having a wall to wall overflow box that will skim the top surface of the water, and I want to make all out of pvc pipe. The design: 1)The vertical pipes with the large holes...