Aquarium salt is often used in freshwater aquariums to help keep fish healthy. It can also be used to help plants grow. However, it is important to use the right type of salt and to follow the directions on the package carefully so that you do not harm your plants.
There are two main types of aquarium salt: Epsom salt and rock salt. Epsom salt is made from magnesium sulfate and is safe for most plants. Rock salt is made from sodium chloride and can be harmful to some plants.
To use aquarium salt to help your plants grow, add one teaspoon of salt per gallon of water in your aquarium. Make sure you dissolve the salt in the water before adding it to your tank. You can also add a small amount of aquarium salt to your plant's potting soil before watering them. This will help provide nutrients that they may be lacking.
If you are using rock salt, be very careful not to add too much as it can damage roots and leaves. Start with a very small amount, such as one-eighth of a teaspoon per gallon, and increase gradually if needed. Be sure to rinse any excess off of your plants before putting them back into your aquarium so that they do not come into direct contact with the high concentrations of sodium chloride.