Originally Posted by deaDFisHFood

Hmm... How big a midori are you looking at?
The second seems to be wad they call an aya wakaba, a relatively new breed.
Kois exceeding 80cm(i think) are known as jumbo, and Chagoi, benigoi and most other single colour koi tend to grow in excess of 1m.
BUT!! Local kois seem to be generally smaller in size, so...
In all, If u have the space, the BIGGER the BETTER! but if you cant, just don't overstock!