Hdeuce;2089012; said:common misconception salt doesnt help with nitrites, But i use it in my tank all the time 1 tbsp / 5 gallons, every water change i make sure that i keep the amount even with the new water seems to promote healthy livin for my fish. .... but dont add any when you add water due to evaporation!
I totally disagree with the above comment. There's an excellent article at
http://www.skepticalaquarist.com/docs/health/salt.shtml
Also, adding salt with each water change to a freshwater fish's tank is not a good idea. If you want to promote 'healthy living' for your fish, give them an extra water change each week and save the salt for your popcorn.