Can I make a suggestion regarding the stand.
I have two stands that require the removal of the aquarium above to get the sump in or not. Not that you move sumps in and out of stands very often, but, this is a bit of a pain. I wish I had considered this before I built my last stand.
There are two workarounds that I've seen, that I thought were absolutely brilliant. One, is, if you make your stand one all-enclosed unit, make your front cross beam a 2x6 or 2- 2x6's together. Super strong, and it won't need a centre brace (well, hopefully, anyways). Then you can have your cabinet doors open all the way, and you can slide big large items (like sumps) in and out of your stand.
The other one was, the stand itself is just steel or lumber or whatever, and the outside is a removable facade. You can make the stand itself to be completely industrial and strong and all that, and the facade can look nice and all of that. Jamie Cross has a stand like this (look for one of his posts then click on his website and you should be able to see what I mean).
PS. I don't think anything kills mushrooms. yeah, please don't get me wrong I would never steer anyone away from anemones (they're MY favourite reef critter). I just mean, proceed with eyes open. A dedicated species tank for an anemone is the best way to go (just my opinion, of course.
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cheers