ask the store what the dimensions of the tank are. most of the corner units i have seen are taller than they are long so they do not stick into the room and take up alot of living area.
if you are looking for a tank for the larger, or tankbuster, cichlids, i would reccommend a longer tank. if space is an issue, you can incorporate the tank into the room. i have my 240 for a headboard in my room and am turning my 180 into a base for my bar in the family room. to make life happier for you, i would suggest choosing the fishand then tank. choosing the tank and then fish you may wind up with fish you don't really want.
sf