This is a common myth. Mostly aquarium salt is no different than table salt, save only for the cost. I will try to find a link to a thread on this where some of the more science minded folks here give thier input on the subject. Also, iodized salt is a subject of debate, though some of the folks I mentioned claim the iodine is present in such low levels there is no effect to the fish.budrecki said:Please don't use table salt! Aquarium salt onyMost live bearing fish do better with a little salt to taste, 1 tablespoon per gallon.