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dOHd: I think you have me confused with someone else's post? I do not have plants in the pond. None to yellow. (I do have a separate waterlily pond where fertilizer can be used when desired.) I did make the point early in this thread that a truly effective plant filter would not be growing beautiful plants. This is because the mass of plants would be sufficient to exceed nitrogen production of the fish pond. Only plants with low nitrogen needs would be able to take the competition, and these would not reach their potential. Taro is a plant adapted to nutrient deficient soils. Very efficient at capturing nitrogen where other plants struggle. But, as big as Taro can grow, it has extremely high water ratio. There is not much there compared to the volume you perceive. When dried, a 7' Taro's weight is a matter of ounces. So, a lot of mass created by the water-retentive cell structure on very little nutrient. I think your large weekly water changes are the key to your water quality... and I applaud you for doing them. A koikeeper with good source water has a wonderful resource and should take advantage of it.
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