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Photo by Punchiechip

I use kosher (David’s Kosher Salt - no additives - NOT MORTONS!) as a medication. Aquarium Salt also works, but I usually have David’s around.

I use a MILD solution, 1/2 teaspoon per gallon.

  1. I first do two 25% changes in the water - just conditioned water - an hour apart.
  2. In the second one, I dissolve what would be closer to 1/4 teaspoon of salt per gallon for the whole tank. DISSOLVE IT COMPLETELY!
  3. Add it slowly and try not to dump it on top of the fish!
  4. I do another PWC later (how much depends - use your judgement but no more than 30%) and add the balance of the salt to bring it up 1/2 teaspoon per gallon.
  5. Continue to do PWCs each day, adding back the salt you removed (IOW if you removed a gallon, dissolve 1/2 teaspoon in the clean water) Keep this up for up to 7 days.
  6. Then continue with the PWCs each day but NO SALT and it will slowly be removed from the tank.

All that said - the PWCs alone would usually work - and this is an extreme measure.

So... what do you think? Please leave me a comment or give me a


  • Vale: When you say not Morton’s is that because it contains iodine?
  • thea: @Vale. Yes. Iodine is poisonous to fish.
    @EvB. I would only add that the salinity of the water should be increased over 24 hours. A slow increase will not bother a fish. A rapid change will not allow the fish to adjust. Like everything else in the fish business, when acclimatizing to change, slow and steady is the rule.
  • Vale: thanks thea!
  • EvB: Morton’s kosher has something else in it for flow, not iodine. David’s is pure sodium chloride. As i said, Aquarium salt is always safe (if salt is at all) David’s Kosher Salt is just something I usually have and dissolves MUCH FASTER,

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