Chloramines are toxic to fish, shellfish, reptiles and amphibians and must be removed from water, just as chlorine is toxic and must be removed. You may not have had to remove chlorine from your aquarium water, however, because it disappears rapidly on its own. This is not the case with chloramines and steps should be taken to remove chloramines. Most pet stores have sold dechlorinating agents for years and, generally, have recommended using them. The chemicals used to remove chlorine should work just as well for chloramines. Several manufacturers have been adding chloramine information on labels on their products for years.