All salts are not created equal. Aquarium salt contains sodium chloride. It treats minor injuries, bacterial infections, and some fungal infections. Use a quarantine treatment tank for aquarium salt treatments. Aquarium salt accumulates in the water and is not removed by filters. Only water changes can decrease aquarium salt levels in the water. High salinity levels are deadly for freshwater fish, shrimp, and snails. Your live plants also will not survive aquarium salt treatments. Marine salt also contains sodium chloride. But it has trace elements and other buffers meant for saltwater tanks. These buffers are harmful to bettas and other freshwater fish. Epsom salt is a chemical compound of sulfur, magnesium, and oxygen. It is safe for short-term treatment of common diseases in betta fish. Never put table salt in your betta tank! Table salt contains chemical compounds like iodine and anti-caking buffers. These chemicals are deadly to aquatic wildlife.