ill double down, i use water softened water in my tanks, and i add salt to the tanks on top of that. never had an issue with my amanos doing this, nor my fish, nor my plants. pretty much every animal on the face of the earth needs some salt in its diet. co-op Cory uses tons of crushed coral, anybody want to guess how much salt is in coral? i dont know the answer, but its more than what a water softener is putting in your water. if you cant taste the salt in your tap water (you should not be able to, if you can, something is wrong with your softener) its not enough to bother anything.