One more item to note about the addition of salt to your aquarium. If you have catfish, especially cories, adding salt will definitely help with stopping disease almost as much as frying or sauteeing them. Several species of cories have a very low tolerance to salt so while you might kill the parasite and save some of your fish, you may also kill others such as cories. Be careful to know your fish's tolerance to salt levels before you add it.