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That's right Kong. And as a frequent visitor to Japan I can tell you that every other breeder, when bringing koi in from the mudponds, floods the concrete indoor ponds with shows from stacked plastic milk crates filled with aged oyster shells. We used to see that as just a bugger system but in truth, oxygen, degassing and buffering are all at work. Without this the fish often sit on the bottom and sulk. No one is an Island and Maeda is , like the rest of us, a product of his observations and experiences. He was a hobbyist who likely frequently observed this like the rest of us.I imagine being a creative and energetic personality, he obviously took this basic observation to new heights.
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