The only problem I see with the current location is all the unsightly cables that will be visible...I like the being able to see it from all sides, but you will have to route the cables somehow (perhaps tie strap them down one of the corners) from lights, pumps, fans, etc, etc...so it won't be an eyesore and take away from what can very well be one great looking tank.

as far as it possibly being unlevel, you may want to put some fresh water in there and use a level to see if you are right on (no need to completely fill it, just enough for you to place a level against the glass), then shimmy as needed on the back side of the couch, so it won't be visible.

As you can tell, I am all about the aesthetics of a tank....welcome to MAAST