If the aquarium tests positive for ammonia, act quickly by doing a partial water change and then neutralise the ammonia. Ammonia is toxic to fish cells, especially the gills. Ammo-Lock is a liquid treatment proven to protect fish cells from ammonia. Ammo-Lock works instantly, in both fresh and saltwater aquariums, to detoxify ammonia and remove chlorine and chloramines. Ammo-Lock locks up ammonia in a non-toxic form until it can be broken down by the tank’s natural biological filter. Eliminates fish stress and promotes healthy gill function.