The plan for the refugium:
The refugium will be a 125gal tank with the overflow plumbed directly into the return section of the sump. One of the most maintenance free tanks I ever had was a deep sand bed (DSB) tank so this is what the refugium will recreate. It is intended to be a biodiversity sink to feed the main system. The tank will sit in front of a 6 ft east facing window so will be partially sun lit. I have two 72" Reefbrite 50/50s that will be used for supplemental light in the afternoon.
The refugium will have an under gravel filter to serve as a plenum with a thin layer of crushed coral on top. Above that will be the DSB. I will have one tube on each end of the under gravel filter that will slowly move water under the DSB. The goal is to allow this space to serve as a cryptic zone and prevent it from going anoxic. An air stone will be used to create a gentle flow through this zone.
I will also use some miracle mud sand in this system. Was planning to mix with the DSB but am now thinking of making two compartments to place this sand on top of the DSB. That way, when I refresh, I'll just need to remove one compartment and replace the sand and put back in, avoiding the need to disturb half the DSB. Not exactly sure how I will do this yet.
This refugium is also part of the move plan as well. Right now I have a 40 gal breeder tank full of KP aquatics rock, sand, and some frags. This will be moved to the 125 as the start. I then plan to use 2 40 breeders as temp fish housing for the fish in the Reefer 450 while I set up the main tank, plumb, mature, and introduce the regal angel. After all that, the fish will move to the main system. The corals in the 450 will be fragged and kept in the 125 until the main tank is ready for them.
Still now word on the star of the show, the tank!