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You don't have to, but a small amount of salt for freshwater tanks acts as a soothing 'tonic' for freshwater fish. Follow instructions on the package.
Freshwater fish derive small amounts of salt from their freshwater habitat. If you place a freshwater fish in saltwater, the difference in habitat will cause the fish to burst.
The absolute least amount salt would be freshwater, but brackish water - usually being a combination of seawater and freshwater - contains less salt than seawater.
The amount of freshwater today is 25% be4cause there is 75% salt water.
Salt and freshwater are not nutrients.
The addition of any ionic salt (even small quantities)
No Oceans are not Freshwater, they are salt water
Salt
No. Freshwater does not have the same amount of dissolved materials as sea water. Sea water has a much greater amount of salt dissolved in it.
Lakes will usually have freshwater.
Freshwater is water that contains no salt or sodium.
Ocean water has salt in it, Freshwater does not.