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KoiLab.com - Research facilities for Koivet.com's Dr. Erik Johnson
Koinews.com - News from the Koi World, updated as it happens!
KoiClassifieds.com - Don't store that old pump. Sell it! Low listing costs!
Tricide Neo - Fight infections, easier than injections, safe and simple.
Pondrx.com - PondRx has almost every medication, resource or help you could need with your fish health problem, complete with usage guides written by Dr. Erik Johnson.