API AMMO-LOCK, 16 OZ

API® AMMO LOCK Ammonia Detoxifier is scientifically proven to protect fish from harmful ammonia by converting toxic ammonia into a non-toxic form. The AMMO LOCK Ammonia Detoxifier works instantly in both freshwater and saltwater aquariums, eliminating stress from High ammonia levels and promotes healthy gill function.

Note that if your aquarium tests positive for ammonia, it is necessary to perform a partial water change first, then neutralize the ammonia.