Many fish keepers believe that if the water is not green or brown, fish can exist in it. People may get this mistaken belief from the fact that natural areas of water can periodically look polluted, yet fish thrive there. Nevertheless, natural areas of water have their own processes for providing fish the conditions they need while ridding harmful substances. Your tap water may be nontoxic to drink, but it is not nontoxic for fish to exist in. Tap water has chlorine, iron, and possibly small portions of lead and copper. Tap water can also be too hard or soft for your fish, or consist of an abnormal pH. Luckily there are options to make your tap water appropriate for a fish aquarium, including other water selections.

If you decide to use tap water the initial thing you need is something to remove the chlorine. All fish shops will have bottles of an item that you can put in the water to remove the chlorine, and they commonly last a long time. With the chlorine gone, your water will probably be safe for your fish, although you should also examine the levels of copper, lead, and iron in the water. These items are okay for you to drink in very little doses, but fish are much more easily harmed by them. You should also test the alkalinity and pH of your water to be sure it is okay for the fish you intend on keeping. You can also buy items to increase or decrease your alkalinity and pH determined by your wants.

Your other two choices are to obtain pretreated water for your aquarium, or gather rainwater. Purchasing pretreated water is the most pricey option, however it helps you be sure that the water will be prepared properly. This is a good choice when preparing a saltwater aquarium. Rainwater is rid of chlorine and metals and is especially harmless for fish. While contaminated rainwater has gotten a lot of press, it is indeed very rare and you can tell if the water is contaminated without testing it. Rainwater is, after all, what the native fish live in.

No matter which water you utilize you will need to maintain it. Fish eliminate waste that contains ammonia. Incidentally naturally occurring bacteria in the aquarium convert the ammonia into nitrite, yet nitrite is still unsafe to fish. More bacteria changes nitrite to nitrate, which is considerably less harmful. Incidentally this cycle helps a tank attain equilibrium, there are still reasons to examine and change your water. The ammonia generation of your fish could exceed the ability of the bacteria to convert this. This is usually the case with new aquariums that do not yet have enough bacteria in the aquarium. The ammonia generation also rises any time you increase the amount of new fish or raise the amount you feed them. Also, nitrates are still unsafe to fish in big doses. You should test your water and change it often to assist in keeping ammonia, nitrites, and nitrates under control.