500 Gallon 120x34x28 In-Wall w/ Side Views + Fish Room

I am finalizing my overflow with Modular Marine right now (72" long!) and I was wondering if anyone had ever plumbed more than three drain holes in an overflow.

Could I use a fourth as a manifold feed or for some other purpose, or is it adding too much complexity?
 
I haven't thought it completely through, one concern I would have with using gravity to feed a manifold is flow consistancy. Essentially having 2 sources that require certain amounts of water would be some cause for concern. I would imagine after dialing it all in, it would be ok, but anytime you made a change to the full siphon or flow rate to any of the valves on the manifold, you would have to adjust everything accordingly to get proper flow.

It would be cool to see you work all that out.
 
Sump update:

I selected local Maryland builder PimpedOutAquariums to do my sump build. I have a 72" length for my steel stand so I went with 70" for wiggle room. There is an option for 7" socks, but I'll probably skip those other than for times when I'm cleaning the tank and stirring up stuff. There are a lot of bulkheads, as I will have my display tank drains (right side) and then Refugium and Frag Tank returns coming into the sump.
 

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2020 Update

2020 Update

COVID and a new baby have slowed down progress, but things are still progressing. I've had water in the tank since March and things are finally stable. Some of my woes were just from new tank syndrome and getting a massive amount of bacterial filtration instituted. As we always say, nothing good ever happens quickly in reef tanks.

My goal for 2021 is to take a more active approach to updates, so I made a quick Fish Lab video with some full tank shots as well. It's still has a ways to go, and my 4-month old takes all my time when I'm not at work!

Here is a quick video of the behind the scenes:
https://www.youtube.com/watch?v=uNwmKkFvzXc
 
To nudge myself toward creating new video content, I'm going to try to add some more subscribers to my YouTube channel.

At 11:59pm on December 30th, I will be giving away eleven $10 gift cards to Bulk Reef Supply. Anyone who subscribes to my YouTube channel is eligible and I will notify those usernames (chosen at random) so they can place an order on the 31st.
 

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