The first tub is complete. Its plumbed to the central recirculating system and inhabited by a dozen SXK 11/10 (Ranchumaniax).
Its nice to have a square foot per fish.
2 inch main recirculating water line feeding a one inch vertical manifold that supplies water to each of the three shelves.
The tub is plumbed into a 2 inch drain line returning water to the main sump. The sump is plumbed to drain via the 2 inch drain line. Its nice to have sumps plumbed to drain so they don't overflow if tap water is left running a little to long.