DYI Overflow

[Wingin It]

I've seen one on another members tank, it worked really well and is what i'm planning on doing when I get my sump set up.

[tidal_waters]

I just realized I won't be able to do this without a second return pump rated a little over the stock solana pump. As the return water line would have to drop back into the 3rd chamber and from there pumped back into the display.
There was a link here before that had head loss calculations, anybody know where I might be able to find that?