Here's a rough schematic of what I want to do to the tank, the plan is to use as room divider simply to get 3 viewable panes, 2 of which are the long 6 foot sides, granted this will take more careful aquascaping since the tank is only 18" wide, but I'll probably give it a try. The first main thing is because it'll be as a room divder, the tank is not drilled (and probably tempered glass) all piping and plumbing have to come off the back wall, which unfortunately has a thin brace right on either side. So the that makes my current CPR overflow box completely useless, since it's designed to slip over a thin edge of a tank. So the plan is to get some acrylic and attach it directly to the backwall using silcone (and maybe superglue or epoxy.. although I'm hesitant to make a permenant fixture). to maximize the total surface area at the top of the box I'm thinking a trapazoidal shape will best suit my needs (I still need to crank some numbers to really see, but I'll be damned if I'm going to do a half circle design to truely maximize the perimeter). Then I need to think about where to put pumps in the tank, with the trapazoid I'll have less room to wedge them in, I could put them under the bottom of the skimmer too, and also in the front corners to get the flow going nice, although with 3 panels I dont know how aesthetically pleasing that'll be. I'd do a closed loop system, but the pumps I have (Seio 620) really are nice little pieces of work and they aren't designed to use with external piping, so maybe a rectangular box would work then they could fit on either side of the overflow, either way I'll need something at the front part of the tank to push water back towards the overflow.

Unfortunately this will leave my fish displaced for a longer period of time, luckily I have a 55 gallon tank sitting downstairs for them, and some rubbermaid garbage cans to house excess water and rock.

Now here's a schematic of the room, as you can see there isn't much room to chop up. An idea I was toying with for the longest time was to put my computer desk in there as well, but that was before I had the tank, so who knows about that. There are 4 walls I can put the tank on (as a room divider) and any way you chop it up it's going to be a stretch, while I will have atleast 4 feet on both sides of the tank, 4 feet really isn't very much, although I am tempted to use the closet as a working space type area for a sump (but probably not since I'm satisified with my current sump/refugium setup, other than possibly making a stand for the refugium so it's visible), then of course I was thinking of putting it extremely close to the door, so its visible from the outside the room, and if I wedge it tight that'll give me about 4.5 feet on the otherside which might be nice. The flip side of the coin is to just go with the way it is now and have 1 large visible pane, problem is I'm restricted to 3 walls then, 2 walls if I want to have both small sides visible (ie not in a corner) but then I basically use up an entire wall if I go that route, and if I do another tank down the road I'd be nice to have the flexibility to expand. Also against the wall means I need to leave a good size space for me to squeeze behind if I need to work on something, where as a room divider the width of the tank is 18 inches, so that much space wouldn't be needed.

BTW if anyone was thinking bust out the wall and do in the wall(as there is a hallway on side with the door), I was thinking that but, I'd rather not to do any remodeling of that nature as this might not be the house I live in on a long term (even though I've been here 5ish years), and the new owners might not have a tank to fit a 6 foot x 2 foot hole in the wall, as the tank will be going where I go. Regardless of which way I cut though, I'll have build a light mock up of the size of the tank, out of cheap 1 by material and cardboard, just to get a feel for how much space will be there