I have a 30 gallon fresh water plant tank. My LPS told me that my fish would be healthier if I added a bit of aquarium salt to the water. They suggested, that on my first 5 gallon water change I add 3 tablespoons of salt. At every other weekly change, I add 1 teaspoon. I figured they knew what they were talking about. Since doing that I have lost many fish ( neons, my catfish, my placo, a sword, plus God knows what I haven't found yet. My plants are also doing very poorly. I just finished a 10 gallon water change with fresh water only. Did I do something wrong or was it bad advice from my pet store ? What are your thoughts ?