Where are you getting a Jar reaching 3' from? One of biggest Jar I know of is Toby's 64cm which converts to a little over 25". Hell most silver aros top out just over 30".
A Jar could live in his tank for life, it would be better off with a 72" x 30" + footprint, but 72" x 24" will do.
Tries multiple methods of introducing said photos. It says "failed to connect to forums, please check with the administrator if this problem persists." and "you are not logged on or do not have permission to do this action." The latter comes first then the first 1 I typed appears second. I typed wrong order. Message goes away in like half a second I couldnt even read more than a word at a time so I had to try like 30 times.