chloramine: translation
an ammonia-chlorine chemical sometimes used as a bactericide in municipal water supplies. It it poisonous to fish, but can be removed with special compounds available in aquarium stores, e.g. a double dose of sodium thiosulphate. Unlike chlorine, it will not evaporate from water by itself. Fish with chloramine poisoning dart around rapidly and may leap out of the water, show pigment changes and exhibit hypoxia, and may die