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Smelling salts are a chemical compound that releases small amounts of ammonia gas, which essentially jump starts your bodyâs nervous system. The ammonia causes blood vessels in your nasal passages to expand providing an instant increase in oxygen to your brain meaning an instantaneous boost of alertness and power.
NH3, the form of ammonia that is toxic, is a dissolved gas that permeates the water. By increasing the aeration of your tank's water, it might help diffuse that ammonia gas out of the water and into the air. Aeration won't do much in a large pond, but it might help manage ammonia levels in your fish tank.