man if this wasn't my girlfriends place I'd have it packed with tanks....the basement extends twice the length from the entrance down the stairs to the end of my 125 farthest away form the stairs. What I have setup takes up only a tiny portion of my basement. Only problem down their is limited electrical outlets. The walls on the back half of the basement not drawn out are constructed of cinder blocks and there is basically one big cinder block shelf that goes along the entire basement wall in the back...its about 4ft and 2 ft deep....to put it into perspective I could put around 30 20gal longs (30" long) on the shelfs alone and thats only the back half of the basement....right now its all completely empty;(