Greenish Water Caused by Algae Bloom

• 1). Change half the water in your aquarium. Replace it with plain, dechlorinated water.
  
  
• 2). Leave the lights off for 24 hours.
  
  
• 3). Add live plants and fertilize. Plants consume the same nutrients that algae does. They will consume the excess nutrients so the algae doesn't have anything to feed on.
  
  
• 4). Repeat the large water change in a two or three days if the algae bloom is still present.
  
  

Grey-white Water Caused by Chemical or Mineral Imbalance

• 1). Remove any newly added decoration. They may be leaching chemicals into the water.
  
  
• 2). Do a 50 percent water change. Replace with plain, dechlorinated water.
  
  
• 3). Stop using any other unnecessary chemicals in the water, including those designed to eliminate cloudiness. They can aggravate the problem.
  
  
• 4). Have your pH and water hardness tested. Water with a lot of minerals can become cloudy. If your pH or hardness is out of the safe range for the type of fish, you may have to consider another water source.
  
  
• 5). Continue doing large water changes every few days until water clears or you have discovered the problem (pH or hardness).