Yes salt is beneficial to your fish and improves the aquarium environment. Add the salt slowly to a maximum of 1- 2 teaspoons per gallon. Only add salt if you are replacing water and only I ratio to the amount of water you are adding. Don’t add more salt if you add water due to evaporation. Remember not all fish tolerate salt well, South American Tetras and Cory Cats do not tolerate salt well while Mollies do well with even more.