wall aquarium has lots of problem especially if you keep marine fish. You can google it and find my results on this. If you intend to do up a nice marine tank, go to webbie like sgreefclub etc to take a look 1st before you commit to it.
Marine aquarium is very nice....but it comes with hell lots of trouble in maintenance and not to mention the $$$. I was starting with nano cube then changed to Red Sea Max. Kena disaster once when my house was flooded due cracked tank......
One more thing to mention the water chiller is sucker for electricity.
Good source for marine aquarium locally is sgreefclub or absolute reef online.