Adding Salt To A Freshwater Aquarium

By Aquarium Addons | Jul 19, 2008

Over the last couple years I have had a fish tank, I have had good success adding a little bit of salt to the tank. I started on the recommendation of the fish store and have continued adding 1 tablespoon for each 5 gallons when I add new water to the tank. So far, it has not caused any harm at all.


Photo by dlkinney

Benefits of Adding Salt to a Freshwater Tank

But what are the actual benefits of adding salt to a freshwater tank.

  • Reduce stress to the fish’s gills (especially during sickness)
  • Helps promote slime layer which speeds up the healing of injuries
  • A lot of the bad things that cause fish to get sick have trouble surviving when salt is added to the water

My fish have generally been health so I keep using the salt.

What Does It Cost to Add Salt to a Freshwater Tank

Since you normally add 1 tablespoon for each new 5 gallons, the cost is pretty cheap. This 65 oz bag of aquarium salt at Amazon is under $7. I bought less than that about 9 months ago and still have several months left.

How Do You Add Aquarium Salt to Your Fish Tank

Before I use my Python (link), I fill a bucket with water and mix in the salt and any other chemicals that I plan to add. I mix it up well and then dump it quickly into the tank. Pouring quickly helps get as much of the salt as possible in the tank since it does have a tendency to stick to the inside of the bucket when I poor slowly.


Photo by Leino88

Alternatives to Adding Aquarium Salt to the Tank

While almost everyone agrees that salt helps the fish when they are injured or sick, not everyone agrees that you need to add the salt to the tank. An alternative would be to add water and an appropriate amount of salt to a bucket, then move the sick or injured fish to the bucket for 5 to 30 minutes, and then put him back in the tank.

When Is It Bad to Add Aquarium Salt to the Fish Tank

Live plants do not do well with salt in the water. I am considering starting to add live plants and because of this will be phasing out the salt. There are also certain kinds of fish that cannot handle salt. Particularly fish from the Amazon and fish without scales. Make sure you make sure your fish will be safe before adding salt.

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