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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.
Ammonia poisoning is a very real threat to your fish, especially when the tank is new and is still cycling or if the tank has been stressed and the biological filter has been upset or removed. Ammonia stress is caused by two occurrences in the aquarium chemistry. First is the build up of toxic ammonia and nitrite in the water. This directly affects the fish and can have a number of harmful side effects - from increased disease susceptibility to organ failure. The second component of ammonia stress is the displacement of oxygen in the water by the ammonia.