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OK..I've been reading this thread and trying to figure out ways to use this information. I often try to use information from my reef keeping hobby and incorporate that into koi keeping. In the reef hobby, some of us use something called a refugium. It is a small separate tank, connected to the main reef tank. It is often filled with mud and sand from a natural reef. Many of us place marine plants and macro algae in there as well. It is a wonderful place to grow copepods and small marine shrimp. This is also effective at releasing minerals and nutrients into the main tank. It is also where these small shrimp will reproduce, grow..and produce food for corals...such as zooplankton and larvae. Sooo.....Imagine a tank attached to your pond...filled with this soil from nigata. Also filled with crayfish and some water plants. It would release the cobalt and other minerals. In addition, if the crayfish reproduce, you can feed them to the koi. It would be a pond, freshwater, refugium. Where can we order this type of soil? I would try this in a 260gal fiberglass tank I have plumbed to my filters.
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