Yep, that's the one, 100 gallon. The 50 gallion was the early tank, and looked small, obviously. The 100 gallon looked 'in proportion', and was the most commonly seen tank (in photos anyway), whilst the 200 gallon looked huge and bloated in comparison. I've seen some resin tanks in the various sizes somewhere, can't remember where, but if you've got or can get the 100 gallon, go with that.