you can call them what you like, "asian", "overstocked", "crowded" or "Japaneese style" tanks. They are basically all the same thing, but the following is needed to properly maintain them. You need to have heavy filtration, a very large tank(although you could do a 75g with tertas andother small fish) and be experienced in fish keeping. The massive bioload will have an end result of a massive amount of nitrates, the nitrates can only be removed with water changes or expensive, high tech, Denitrators.
Personally I like the way some look, but don't care to atempt something such as this. There are those, who will say this is wrong for the mental well being of the fish. I think that most all fish find comfort being in large schools.