The pvc hanging down is where the overflow drains. It’s a 90g with a standard durso drain pipe. What compartment should the drain go to? There’s small holes where the red lines are. I think that small compartment will over flow if that’s the first section the water hits. Do I have it backwards and need to flip it?
Is the return pump in the right section or should I drain into that section?
Weird sump, I know, but I can’t upgrade it right now so it will have to do.
What do you guys think?

Is the return pump in the right section or should I drain into that section?
Weird sump, I know, but I can’t upgrade it right now so it will have to do.
What do you guys think?
