This is from AquariumFish.net
Aquarium Salt has no additives such as iodine or calcium silicate. Small one-pound boxes of Aquarium Salt, like the one shown at the top of this page, are sold in most places that sell freshwater fish. A one-pound box of Aquarium Salt is very inexpensive.
Salt, NaCl, does not change the pH of water. It also does not change the hardness.
A few fish do not tolerate aquarium salt. Corydoras catfish and many live aquatic plants do not do well with salt in their water.
In my aquariums both Corydoras and many plants will tolerate 1 Tablespoon of Aquarium Salt per each 5 gallons of aquarium water, and they do poorly with 2 Tablespoons of Aquarium Salt per 5 gallons.
Salt lessens the number of pathogens in the water. For example very few, perhaps only one or two groups, of freshwater bacteria tolerate aquarium salt well. My experience is that salt is slightly effective in preventing fish trouble in freshwater aquariums but only slightly.
Aquarium Salt has no additives such as iodine or calcium silicate. Small one-pound boxes of Aquarium Salt, like the one shown at the top of this page, are sold in most places that sell freshwater fish. A one-pound box of Aquarium Salt is very inexpensive.
Salt, NaCl, does not change the pH of water. It also does not change the hardness.
A few fish do not tolerate aquarium salt. Corydoras catfish and many live aquatic plants do not do well with salt in their water.
In my aquariums both Corydoras and many plants will tolerate 1 Tablespoon of Aquarium Salt per each 5 gallons of aquarium water, and they do poorly with 2 Tablespoons of Aquarium Salt per 5 gallons.
Salt lessens the number of pathogens in the water. For example very few, perhaps only one or two groups, of freshwater bacteria tolerate aquarium salt well. My experience is that salt is slightly effective in preventing fish trouble in freshwater aquariums but only slightly.