Q: We have a koi and goldfish pond with a few plants in it. We have heard that we should add salt to the pond, but we are unclear about how much is OK, how much is too much, what it does and whether it will hurt the plants.

A: Let's cover the reason why first. The fish's body is saltier than the water in the pond. So, water wants to even out the two different salt levels to one average level. The fish have to expend calories to keep salt in and water out of their body. They have a slim ...

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