Coralgurls tank build 180 - it's ALIVE

[Coralgurl]

Sump design.pdf

This is the sump I am working with 60x18x18. It has a section for auto top offs, water in, baffles, skimmer and return section. What if any mods would you make? My thoughts are to add live rock/sand, but add a separate compartment for the refugium, simply block of the end with eggcrate and add some chaeto. This is my first sump so I'm not sure what I should do if anything. If changes are made, its not coming home today. Thanks for any help/suggestions