Fish are quiet, relatively neat, and require only minimal care. But, there are a few things that you need to know.
One of the biggest problems facing the fish fancier is the baffling phenomenon of cloudy water. There is no single answer, because there is no single cause. However based on the color and circumstances under which cloudy water appears, it usually can be pinpointed to a couple of basic causes.
White or Grayish Water
If the water is cloudy immediately, or within an hour or two of filling the tank, it's probably due to insufficiently washed gravel. Drain the tank and rinse the gravel until the water runs clear. That should resolve the problem. If washing the gravel doesn't solve the problem, the next most likely cause of cloudy water in a newly filled tank is a high level of dissolved constituents such as phosphates, silicates, or heavy metals. If you test the water, you'll no doubt find the pH is high (alkaline). In these cases, treating the water with conditioners will often resolve the problem. Another option, that has many benefits beyond resolving cloudy water, is to use Reverse Osmosis water. Your local fish shop may sell it, or sell units capable of making RO water.
Often cloudy water doesn't appear the instant an aquarium is set up. Instead it appears days, weeks, or even months later. In these cases the cause is usually due to bacterial bloom. As the new aquarium goes through the initial break in cycle, it is not unusual for the water to become cloudy, or at least a little hazy. It will take several weeks to several months to establish bacterial colonies that are able to clear wastes from the water. Over time that cloudiness will resolve itself.
Decaying plants or excess food that remains uneaten, can also cause the milky water seen in bacterial bloom. Regardless of the cause, don't panic over bacterial blooms. Keeping the aquarium very clean by removing debris such as decaying plants and uneaten food, vacuuming the gravel regularly, and performing partial water changes, will quickly resolve most cases of bacterial bloom. Cut back feeding to every second or third day, which will cut down on excess food decay. If there are particles of debris in the water that you are unable to remove via water changes and vacuuming, a flocculent may be used to clear them away. Flocculents cause particles of debris to clump together so they can easily be removed by the filter (be sure to clean your filter so it's working at peak efficiency). Flocculents are generally marketed as water clarifiers, and may be found at your fish shop.
Green Water
Green water is a no brainer - it's due to algae growth. Ridding yourself of it may not as easy as diagnosing it. The most obvious cause, and easiest one to cure, is too much light. Placing the aquarium in direct sunlight, or leaving the lights on too long will result in algae growth. Reduce the amount of time the lights are on, and move the aquarium to a location out of direct sunlight.
Nutrients such as phosphates and nitrates also support the algae growth, and must also be reduced to successfully battle algae. A water change will give some immediate relief, but probably won't resolve the problem completely. It's important to deal with phosphates and nitrates at their source to rid yourself of them.
Phosphates come from two sources - decaying matter such as fish food, and from the water source itself. Testing your tap water for phosphates will let you know if you have a problem with your water source. If your water naturally has a high level of phosphate, you will need to use RO water, or a phosphate remover to treat the water. Reducing the amount of food you give your fish, and changing to a brand that is lower in phosphates will also help bring down the phosphates in the water.
Nitrates naturally rise in the aquarium over time, as a byproduct of fish wastes. The only way to remove them is to perform a water change. Make sure your filter is kept clean, and is adequate for your tank size. Also, make sure you have not overstocked your aquarium, or you will constantly battle rising nitrate levels.
A vast majority of cases of cloudy water can be resolved by weekly 10-15% water changes, keeping the gravel very clean, and using good quality food.
*by Jenn Whaller, 365Gay.com
**The Wizard's Goldfish
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