That's a good posting. I never did think about the salt content due to the fish food. I wonder why they put so much salt in the fish food? Do the fish like the taste of salt? Or are they trying to cause high blood pressure so we will buy fish accupril? Anyway, I replace 20-25% of my water per week, and restore evaporative losses with distilled water. If you do that I wouldn't expect it to get too salty, and if there's much ammonia or nitrite your fish will not look very good. In that posting it seems to make the assumption that the reader is taking very poor care of his tank. But the salt is something to be aware of, I had never considered that angle before. I wonder if aquarium water really typically has a conductivity of 1? That would put some hurting on a plant.