Very good advice so far... alot more concrete "stuff" on this very subject will be offered in seminar form at the NorCal show in a couple weeks by yours truly. I will be happy to post on Koi Bito the "outline" of what we have discovered in talking with great koi keepers and used over the past 10 years of showing and judging koi at that time.
(not that this is a tease to get more people to the show
)