Aquarium salt is used to support fish health in freshwater tanks by reducing stress, helping gills function, and aiding recovery from minor injuries or some external diseases like ich and fin rot. It can also help fish maintain electrolyte balance and make the tank less hospitable to some parasites and bacteria.

What it helps with

  • Stress reduction: Fish often handle transport, tank changes, and overcrowding better with a small amount of salt in the water.
  • Gill and osmoregulation support: It helps freshwater fish balance water and salts in their bodies, which can ease strain on gills and kidneys.
  • Minor disease support: It is commonly used as part of treatment for external issues such as ich and fin rot.
  • Slime coat protection: Some keepers use it to help support the fish’s protective slime coat after irritation or minor wounds.

Important caution

Aquarium salt is not the same as table salt or marine salt, and it is not a cure-all. Some fish, live plants, invertebrates, and sensitive species may react badly, so dosage and species compatibility matter.

If you want, I can also give you a simple dosing guide for freshwater tanks.