It has not been mentioned but could you also be getting some run off from surrounding landscape? It looks like your pond edge and rocks could be a bit lower than some of your mulched areas. Or maybe it just appears that way in the pictures.
That was my first thought. Beautiful pond it will come together nicely and the crate and quilt batting or fish safe foam filter is excellent at cleaning up dirty water. Seen it many times so I decided to do that too as a new ponder.Nice hyacinth blooms! You may have seen another thread in which people are lamenting never having them. I have a few per year.
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