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Mike
I end up doing 80-100% water change a week. Interesting. In nature plants thrive on perfect water. Water that has no ammonia, no nitrites, no nitrates. So why are they turning yellow in your pond water? What is so toxic in your pond that even the plants wont thrive?
In my personal pond, I have several plants that are bare root. The Purple stem taro is over 7 feet tall with leaves over 6 feet long. Each year I would pull the taro out, over winter it in the greenhouse, then place it back bare root into the pond. With the massive water changes, settlement chamber, biological filtration etc, wonder why my plants do well and yours turn yellow?
Just currious, as it really takes some lousy water to kill plants.
Now, that being said, in many ponds plants are a needed addition, as the pond design sucks. The plants are the only hope the fish have. Nice thing about this site is that most of the posters here have at least an idea on how to design a pond, if not already in existance.
As for algae, I totally agree. But I have seen water quality really good for fish also turn the algae somewhat off white in color.
Oh and as for the fish in the tanks, no tosai, only the bain of the true koi world, butterfly "koi". So for them, and the crouded conditions, not bad growth. Of course if they were a high class Koi, I would expect better growth, and if they were really good , then less stocking density.
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