The left & right overflows from the display tank are seperate. The Left goes to the surge buckets and the right goes to my DIY Skimmer.
Here's a pic of my DIY Skimmer before the Lagoon was built:
It operates by using gravity to mix water & air & churn it up on the way down to the basement. It's a downdraft design and uses no other pumps. It worked so well that my "real" skimmer (Berlin XL) stopped functioning completely so I just sold it.
The skimmer normally has a bucket hanging on it but I had to remove it for the picture.