I currently have my bci in a 30-g long tank. Looking back along the years, I realize that this tank has been home to a HUGE array of creatures. I got it back in '94 (when I was 13, I might add) as an african cichlid tank from a friend, and it was home to a bunch of breeding cichlids for years. Then I raised a baby iguana in it, who ended up with a friend of mine. The tank was vacant for awhile, until I decided to get a lop-eared bunny, but I only kept him for a few days because my mom made me take him back to the store! The tank became a fish tank once more, this time hosting tropicals like redtail sharks and plecostomus, for a few years. I think I also used it for garter snakes, but that mighta been another tank.
Then it lay vacant in the attic until 2001, when I moved into my boyfriend-and-my first apartment, when it housed leopard- and green- frogs. Then it housed goldfish at our now-apartment until I got a bigger tank, and african clawed frogs for awhile, and then one of my ball pythons lived in it for a few months, and now Apache the boa.
WOW! This tank has been around! I should stress though, that it was Thoroughly cleaned between uses. And oddly, it looks brand new still. I just hope that my life can be as long and productive as this tank's has been.