Saw this ad on CL and went to check it out http://portland.craigslist.org/clc/for/3679094869.html
It's a metaframe 6 foot long tank. Possibly either a restaurant/seafoot display tank or something. Bottom is glass, not slate. Stand is rough as a corn cob. Ridiculously thick glass, is a HUGE project but a mega cool tank that somebody wants, esp at this price.