Im not to worried about the height for thumbnails if it stays horizontal. I just was curious to see if there were any pros/ cons to having a vertical tank that deep.
3'x18"x2' these are the dimensionsI'm assuming that it's a 4ft long tank and that being the case it's going to be problematic getting enough light down to the bottom of it, if you decide to make a vert out of it -just some food for thought.