When it comes to keeping a healthy tank, adding the right amount of aquarium salt is essential. For smaller tanks (10 gallons or less), half a teaspoon per gallon should suffice. It's important to remember not to over-salt your tank; too much can be harmful and even deadly for the fish that inhabit it. Before you add any salt, make sure you have tested your water parameters - including pH, alkalinity, hardness, and temperature - as these can all affect how much salt is needed in the water. Additionally, some fish species may require more or less than others so do research on what specific needs each type has before adding extra salts beyond what is recommended here. With proper care and monitoring of your aquarium environment with the help of regular water tests and diligent maintenance practices such as weekly partial water changes using dechlorinated tap water or an appropriate replacement solution like RO/DI filtered reverse osmosis treated freshwater along with careful consideration of correct amounts of aquarium salt additions when necessary will ensure success in keeping happy and healthy aquatic life!