Well, Niko, I ordered the 20 long today. Also have a couple of friends coming over this week-end to move the organ to storage for me so I can get the area ready for the new 90 display tank. WOW!!! I may even be getting close to setting up the big tank. I'm going to have the 90 tank drilled for overflow and return lines. I think 1-1/2" overflow line should be good and a couple of 3/4" lines for returns. I've got to get baffle glass cut.