i know this is a little bit early but i figured id ask anyhow. How do you guys figure out total gallons of a tank? In about 8-10 years ill be moving and building my dream house (about 10,000 sq feet) and theres a sitting room on the bottom floor/basement and the wall is about 20' long and there is a giant unfinished basement behind it. So i was planning on putting a 20' tank behind the wall to the sitting room (frame it out so from the sitting room you only see the glass) thats also about 3' high and about 4' deep. Just trying to figure out volume of that tank. Id like to know now because within the next couple of years I'm going to start contacting people to help me build this tank. Gonna have everything so its automated and everything.