Tetra WaterClarifier Cloudy Water Clarifier, slide 1 of 1

Tetra WaterClarifier Cloudy Water Clarifier, 3.38-oz bottle

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Clear cloudy aquarium water quickly with Tetra WaterClarifier Cloudy Water Clarifier. Cloudy aquarium conditions are caused by overfeeding, gravel sediment and other particles. Tetra WaterClarifier Cloudy Water Clarifier clumps these particles together to form larger masses sink to the bottom and can be removed during normal filtration or gravel cleaning. It is phosphate free and safe for use in a freshwater aquariums.

Key Benefits
  • Phosphate free and safe for all freshwater aquariums
  • Clumps contaminants for easy cleaning
  • Starts to work in minutes so you'll notice results quickly
  • Adding this to your aquarium will allow your filter to work less making it last longer
  • Clears cloudy pond water quickly giving your fish the clear water they deserve

See all items by Tetra

  • Item Number
  • Aquarium Type
  • Fish Type
    Tropical Freshwater, Betta, Cichlid, Goldfish
  • Product Form

Safe for all freshwater aquariums. It will not effect bio-filtration, pH, or any other water parameters, and it is safe for fish and plants.


My water is cloudy. How can I clear the water?

The cloudiness you are experiencing is probably one of two things. First, overfeeding your fish can cloud your water as the uneaten food is allowed to decompose. At each feeding you should feed no more than what your fish can eat in one to two minutes. Overstocking the tank (too many fish) also can cause cloudy water. Excess waste, like excess food, gives off ammonia and nitrites. You should have 1 gallon of water per one inch of (mature) tropical fish. Have three gallons of water per one inch of goldfish. It is best to buy the largest aquarium you can afford. The larger the aquarium, the more waste your aquarium can handle before it becomes a problem to your fish.Second, your aquarium could be experiencing what is known as “new tank syndrome.” When you set up a new aquarium or when you carry out a large water change, it is very natural for your water to become cloudy as part of the system’s normal biological cycle. The reasons for this are fluctuations in the nitrogen cycle, and the release of gases in solution as the result of an increase in water temperature. A water change of 50% or more will help by restarting the cycle. Also, be sure to monitor and change your filter cartridge on a regular basis. A good rule of thumb is at least once a month, or twice a month if you have a heavy fish load or if you have fish that produce more waste such as Goldfish or Cichlids.Have a pet store test your water, or you can purchase Tetra EasyStrips™. High ammonia and nitrites would indicate excess food or waste. A 25% water change will bring down these levels until you can fix the problem.Also, be sure your filter is properly rated for the size of your aquarium.

My water is green!

This is due to algae in the water. A few things can cause excess algae. The first thing is direct sunlight on the tank. Make sure your aquarium is positioned where this can’t occur. The next thing is excess nutrients. We suggest you have one inch of fish per one gallon of water. For example, a 10-gallon tank should have only 10 fish that are one inch each. More than this will elevate ammonia and nitrite levels. As a result, the algae will have plenty to feed on. To solve the problem of green water, do a 50% water change. Scrub down the insides of the glass with a magnet scrubber or scraper (but please…no soap!). Remove any artificial plants and ornaments, and pour boiling water over them. Wait one whole day, then do a 25% water change. Cut back on your feeding. Your fish should eat all the food in two minutes or less. This should help get your tank in good shape. You may also install a UV clarifier. This is installed in-line with a canister type filter that is placed in a cabinet or stand beneath the aquarium.

My water has a very bad smell to it. How can I eliminate the smell?

The first thing you should do is test your water with Tetra EasyStrips, for high ammonia and nitrite levels. A bad smell is usually a sign that excess waste is in the tank, and usually excess food. To correct the problem, change out 50% of the water, wait one whole day, and then change out 25% more of the water. Make sure when you feed the fish that they are eating all the food in two minutes or less. You should have one gallon of water per one inch of tropical fish. Have three gallons of water per one inch of goldfish. Make sure the water is properly filtered as well. Be sure to use Tetra AquaSafe® when replacing water to make your tap water safe for your fish.

Why should I test the water in my aquarium?

In nature, waste products from decaying matter, fish waste, and other animal waste are naturally filtered. The harmful ammonia and nitrites are removed by bacteria and plant life. The substrate at the bottom of a body of water will absorb harmful chemicals and decaying matter like a natural filter. The actual size of rivers and lakes will keep water healthy for animals. The larger a body of water, the less lethal any harmful chemicals will be to its inhabitants. In an aquarium, the natural filtration is replaced by equipment, which filters the water. The larger the aquarium you own, the easier it is to keep the water balanced and healthy. To ensure the ammonia and nitrite levels have not reached harmful levels, be sure to test the water. To understand how filtration occurs, one needs to understand the cycle. Fish waste and other decomposing material will produce ammonia. In high quantities, this chemical will kill animals in an aquarium.A new system will not have nitrifying bacteria present. Ammonia levels and then nitrite levels can reach deadly amounts. If this happens, partial water changes will bring levels down without destroying all of the nitrifying bacteria. This will only last about four to six weeks before the tank “cycles.” Or, you can add Tetra SafeStart® to your new aquarium. SafeStart® accelerates the establishment of the bio-filter in newly set-up freshwater aquariums. The live bacteria start working immediately to provide a safe and healthy environment for your fish without the long wait. SafeStart can also be used after a water change, when adding new fish or after medicating.Elevated levels of ammonia and nitrite should not occur in a “cycled” tank. Causes of elevated levels in a mature system would indicate overstocking or over-feeding, and should be corrected immediately.

Rating: 4.6 of 5 stars 8 Reviews 8 Reviews 4.6 out of 5 Stars

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Rating: 4.6 of 5 stars 4.6 / 5

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  • 5 out of 5 stars

    Cloudy water

    By Tutt on Apr 21, 2021

    It really really really works. Cloudy water now clear

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  • 5 out of 5 stars

    Great product

    By Darrell on Apr 2, 2021

    Works great. Made my tank crystal clear in two days.

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  • 5 out of 5 stars

    This is the best i have ever used!!!

    By Saija on Apr 17, 2020

    Awesome for cloudy tank. You will not be disappointed. I ahave bought many brands but this really works!!!

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  • 5 out of 5 stars

    Worked Great

    By Brandi on Nov 12, 2019

    It took a couple day's but it helped clear the cloudy water in my Daughter's tank really well. Before you could barely see her Fish and know it's clear.

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  • 5 out of 5 stars

    Very effective

    By Otto on May 22, 2019

    It cleared my tank within 4 hours. My fish are very happy with the clarity now.

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  • 4 out of 5 stars

    Helps alot!

    By Lisa on Nov 17, 2018

    We have a routinly cloudy tank, this really helped clear the water!

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  • 3 out of 5 stars

    Not the best

    By Doglover on Jun 1, 2018

    I'm not sure this is the greatest stuff. I've found one that works much better and quicker. I won't throw this out though so I'll give it another shot.

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  • 5 out of 5 stars

    Aquarium Fish Family

    By BEAR on Feb 1, 2018

    Found all the products I needed for my fish family

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