The normal rules of using the salt in the water are one or two tablespoons per ten gallons of water. It is the normal standard to add the water in the aquarium. It is essential add other electrolytes in the aquarium water. It is important to add the clean water in the certain period of time.
It is essential to add the salt into the water to manage the water pH and it is more important for the better health of the fish. I think, you must have to add the salt into the water.