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It won't kill right away, but after a while, the minerals, phophates, and chloromines are going to build up and it's going contaminate your water, cause an algae bloom, etc. Chloromines unlike chlorine is not a gas and is used by water treatment plants instead of chlorine since chlorine would likely dissipate before it got to the consumer. So your typical decholorinating additive is typically for chloromines. In general, you shouldn't be using tap. I would use reverse osmosis water with additives (depending on fresh vs saltwater) and your tank will be happy.
Chlorine is a gas and evaporates off so it can not build up in aquarium water. All water except distilled and R/O (reverse osmosis filtered) contains other elements that are necessary to sustain life. A build up of salts (increase of GH/KH) etc by evaporation is one of the reasons regular water changes are recommended for most fish and absolutely essential for some Amazon River varieties like Discus.
If you are in an area where the water authorities add chloramine (check with your supplier) then the easiest way is to use a commercially available neutraliser. Only Chlorine is added to my supply and I let it evaporate off for a few hours. I can assure you though that straight R/O water is NOT suitable for supporting aquatic life successfully. In order to make it useable the addition of various trace elements is required and that is a very complicated process to do successfully. I know of one commercial fish breeder in Australia who has a large R/O setup and he 'makes' all his aquarium water. Believe me it is not easy or cheap to do. It will kill eventually! :)
What else can I help you with?
Can a tropical aquarium be in sunlight?
It is a dangerous thing to place an aquarium in sunlight because the sunlight may overheat the water and kill the fish.
Does chlorine kill fish?
Yes, chlorine is harmful to fish and can kill them if they are exposed to high levels of it in their water. It is important to always use a dechlorinator when setting up a new aquarium or performing water changes to make the water safe for fish.
Can you use copper pennies in an aquarium and not harm the fish?
No. The copper pennies will slowly release copper into the water, which will kill most small fish. Avoid having any metal in your aquarium.
What factors contribute to the death of fish in an aquarium, and specifically, what can kill a fish in an aquarium?
Several factors can contribute to the death of fish in an aquarium, including poor water quality, improper temperature, overfeeding, lack of oxygen, aggressive tank mates, and diseases. Specific factors that can kill a fish in an aquarium include ammonia and nitrite spikes, high levels of nitrate, sudden changes in water parameters, inadequate filtration, and stress from overcrowding or incompatible tank mates. Regular water testing, proper maintenance, and monitoring fish behavior can help prevent these issues and ensure the health and well-being of aquarium fish.
What does excess algae actually do to the fish in an aquarium?
It can kill them if you don't have a cleaner fish.
Can fish die from eating dust?
Fish will not eat dust. However if there is sufficient dust in the environment and it settles on the surface of the water in an aquarium, it could possibly polute the water and kill the fish by clogging up their gills.
How do you kill mayfly larvae in an aquarium without harming fish?
add guppies
Can water pumps kill fish?
no a water pump can not kill a fish
Which fish can survive in a chlorine pool?
No fish can survive in a chlorine pool. Chlorine is a chemical disinfectant used in pools to kill bacteria and algae, but it is harmful to fish as it damages their gills and scales, leading to suffocation and death. Fish need clean, dechlorinated water to survive.
Can adding live rock kill fish?
yes. "Sometimes live rock is inhabited by nasty critters that can chew on coral or even kill fish. To prevent these creatures from getting into your aquarium, you can dip the live rock in high salinity water or freshwater. After dipping, the organisms will likely flee the rock and enter the water, where they can be sorted and you can add what you want to the aquarium. Mantis shrimp and certain crabs are the most frequent aquarium pests, so be on the lookout for these particularly."
How do you boil a half-filled jar containing water and not kill a live fish in it?
If the jar has water in it with the fish, you will kill them.
Will a aquarium fish die if more oxygen is pumped?
No, they shouldn't. This is of course you are doing it properly. I have heard a story of someone actually blowing into the water with a straw thinking they are putting oxygen into to water. This is just going to stress the fish which could kill it.
