Those measurements are from the tip of the nose to the base of the caudal fin. A foot is still a respectable size for a lima, average is about 10 inches though i have seen a couple of 18" plus monsters.
How big is your house? I mean that tank looks like it take up at least a basement and two master bedrooms? How much did it cost? How did you get it in the door? Or was it asembled in your house? Also how do you preform a vacum cleaning. do you put some scuba gear on and swim down to the bottom and scoop the poo up with a net into a bag?
I have a regular job and earn regular money like anyone else, i just spend my spare cash on tanks and fish rather than expensive clothes, gadgets or cars.