Best Place for Custom tanks?

[Magma]

well I have a 7foot area along an outside wall in the living room which I would love to put the tank along, its right next to our stairs leading into our house and I cant figure out which was the supports run because in the basement suite below us the roof is finished. (I know because I used to live there.)

So 72x18x18 would be awesome to throw into that space just dont know if I would trust it...the house is older as well...