How to Fix Cloudy Tank Water
Published November 30, 2012
Written by Katherine Barrington
Cloudy tank water is a common problem in the freshwater aquarium. If you learn the causes of this condition you will be able to treat it quickly when it happens.
Regardless whether you are a novice aquarium hobbyist or you have been cultivating fish tanks for a decade or longer, you are probably going to experience a problem with cloudy tank water at one time or another. In most cases, cloudy tank water does not pose a significant threat to your fish but it can affect the appearance of your tank and it may point to additional problems such as poor water quality. If you are currently dealing with cloudy water in your tank you should first determine the cause of the situation before you can move on to finding the solution. The key to solving any problem with your aquarium is to take the time to understand the problem first so you can make an informed decision in regard to treatment.
Causes of Cloudy Tank Water
The most common cause of cloudy water in the freshwater aquarium is a bacterial bloom. Similar to an algae bloom, bacterial blooms occur when there is a sudden increase in the number of bacteria present in the tank – high concentrations of bacteria in tank water often results in a cloudy or milky appearance. Bacterial blooms are very common in tanks that have just been set up but have not been properly cycled. The nitrogen cycle is the process through which beneficial bacteria in your tank work to break down wastes, converting toxic substances like ammonia and nitrite into less harmful nitrates. These bacteria thrive in tanks where there is a significant accumulation of organic waste and in tanks where the ammonia and nitrite levels are very high. If your tank hasn’t been properly cycled, or if it has a significant amount of organic debris built up in the substrate, you might experience a bacterial bloom.
Another possible cause for cloudy tank water, as mentioned, is an algae bloom. Algae blooms typically result in green tank water so if the cloudy water in your tank does not have a green tint, it is most likely a bacterial bloom. Algae blooms are likely to occur when the tank is exposed to high levels of light or carbon dioxide and when there is an excess of nutrients in the tank. If your aquarium is positioned in direct sunlight or if you leave your tank lights on for more than 12 hours a day, the conditions could be right for a sudden increase in algae growth – an algae bloom. Excess nutrients resulting from waste build-up in the substrate and high levels of carbon dioxide in the tank may also lead to an algae bloom.
If you are experiencing cloudy tank water for the first time you may be tempted to simply buy a commercial water clarifier off the shelf – if you do, you should not be surprised if the treatment doesn’t work or, if it does, that the condition recurs a few days later. These treatments may help improve the clarity of your tank water but they will not solve the problem that caused the condition in the first place. In order to completely solve a problem with cloudy tank water you need to improve the water quality in your tank and remove the built-up waste from the substrate. Start by siphoning the gravel in your tank using an aquarium gravel vacuum and perform a 25% water change using tap water that has been treated with an aquarium water conditioner. The cloudiness of the tank water may not go away immediately but, as the water quality in your tank goes up, the bacteria should eventually settle down.
Preventing Cloudy Tank Water
To prevent a recurrence of this problem you must take a few key steps to keep the water quality in your tank high and to keep the level of accumulated waste low. Avoid overfeeding your fish because any uneaten fish food will simply sink to the bottom of the tank and break down as waste, providing bacteria and algae with essential nutrients. You should also be sure to keep up with your routine weekly water changes – change between 10% and 20% of your tank volume on a weekly basis and be sure to siphon some of the aquarium substrate during each water change. Replacing your filter media on a monthly basis will help ensure that your filter is functioning properly, removing dissolved wastes as well as solid waste from your tank water.
If you take these steps you should have no trouble keeping the water quality in your tank high. The cleaner your tank is, the less likely you are to have trouble with cloudy tank water.
Castro, Al. “Cloudy Aquarium Water.” FishChannel.com. < http://www.fishchannel.com/freshwater-aquariums/aquarium-care/cloudy-water.aspx>
“Why is My Water Cloudy?” FirstTankGuide.net. < http://www.firsttankguide.net/cloudywater.php>
“My Fish Tank Water Has Turned Cloudy.” OscarFishLover.com. <http://www.oscarfishlover.com/helpful-articles/cloudy-water>
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