you just have to be creative.....
you can move the tank to the end of the wall and have it viewable from 3 sides or you can put it in the middle of the wall , either way you will need to make the whole wall wider to fully enclose the tank so that it is flush with the wall (you will also need to put in access doors and/or panels for lighting, plumbing, cleaning, feeding, etc...
what I would do if you have the $$$$ is cut a huge hole in the middle of the wall and frame it out to be as wide as the tank. add a nice heavy glass top on it and turn your tank into a nice bar style aquarium. granted this will have to be a FO because of lighting issues but would be sweet none the less.