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They have the same problem at the Dr. Sun Yat Sen Classical Garden in Vancouver, BC. They use a type of "blue" clay dissolved in the water to make it opaque. You don't see the koi very well unless they are close to the surface but it deters both the racoons and eagles. It also makes a lovely reflecting surface.
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If you're green, you're growing...if you're ripe, you're rotting!
I try to greet the world like my pets do...boundless enthusiasm, intense curiosity and no concept of yesterday and tomorrow.
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