Reefmonkey
Aquarium Advice Activist
Obviously I am aware of the fact that there are a plethora of different aquarium sizes and shapes, too, but even so, there are a few "classic" rectangular glass tank sizes that are very common no matter who makes them, like the 20 long, the 29 high, and the 55. I wonder why these sizes are so ubiquitous, how and when they got established, especially odd numbers like the 29 (why not 30?), and the 55 (why not 50? Why not 60?). Anyone have an idea?