So this theory was based on a single "informal" study performed on x number of species at a single public aquarium?
Well that's certainly going to supply some rock solid data, for yet another fluff article on how small of a tank can I cram some fish into without them developing artifacts of captivity such as bent fins, bruised snouts or damaged eyes. I guess physiological trauma doesn't factor into this equation?
Perhaps more people should quit asking about minimums, and start spending more time inquiring as to what will offer their fish optimum conditions.