By my calculations that tank would be in the neighbourhood of around 5800 Gallons so a skimmer to handle that would likely be commercial ... maybe check the Vancouver Aquarium for a source to a distributor ... I could think of a really LARGE quad Beckett design with Dual 8" Risers but I am not sure that one would be sufficient ??? would be fun to build tho
... maybe 2 quad Becketts ??
I like the idea of a overflow that runs the full length of the tank as that will skim the surface for you nicely ... any consideration as to sump/refugium size ?
If you use 10/12K 1000W bulbs you might get better penetration right ? ... may even look blue at the bottom just like the real thing
TOTM at RC is a mostly softie tank with Zoos and mushrooms ... looks really cool ( and really colourfull too ) and you wont have to spend a fortune on lighting
Cheers