So what is a "Deep Dimension" tank? Well they were tanks that gave people that extra depth in a "standard" tank that simply did not exist, most standard tanks were at most 24" deep (front to back) these are 36" deep. Now I can tell from personal experience that this extra depth really opens up a new dimension of aquascaping. The tank has what's called "Corner-flo" overflows, they're basically quarter rounds in the two back corners (on my tank), each comes with 2 holes drilled in the bottom for 1" bulkheads. I think they also help pull water from lower in the tank as well as at the surface, but mine is still wrapped up so I can't really tell exactly what they're doing. They do supply plumbing too, however what they basically have is 1 pipe for the overflow (with a 1.5" U fitting) and 1 pipe for return plumbing to shoot out the back of the overflow. Now I'm still on the fence as to whether or not I like/want these overflows, they are fairly bulky, but with the overall tank size might be doable, I really wanted a thin one along the backwall (Module Marine was my first choice, but damnit they close their shop down so often), but I may just live with these because then that's one less thing I have to screw around with. I almost definitely will not use the plumbing as is though and the return will become an emergency drain instead, would love a Beananimal but there's no way to actually do it with only 2 holes unless I somehow connected the overflows together across the backwall, which is an option too. The top has a high density poly frame with a single cross brace (that's very beefy) right in the center, a single cross brace does make me quite happy, and essentially have a 2'x3' section on each side to light up might be a bit easier. Still on the fence over how I want to do this though. Metal halides are damn tempting, because I have all the equipment, but LEDs are such the "in thing" that I may be swayed in that direction too, I just wish there were more reviews/testing out there on LEDs other than Kessil and Radion fixtures though, do I go with Maxspect Etheral fixtures on the cheap side or do I go with GHL Mitrax on the expensive side? Dunno because no one f*cking has done indepth reviews on them! (Looking at you BRS!). Overall these decisions though do not need to be made now, so for now I can get work done, and plan on where to put the tank first.