Claire Corlett

Fish Food, Fish Tanks, and More
How to Fix Cloudy Fish Tank Water | Aquarium Care

How to Fix Cloudy Fish Tank Water | Aquarium Care


Cloudy water is typically caused by a bacteria
bloom. Usually if you do too much maintenance on
the tank, if you clean the filter, do a big water change, gravel clean, you’re going to
be upsetting the balance of the aquarium. Bacteria is going to take to the water column
and start scavenging waste out of the water right in the water column. In time, usually, it settles out. But, if you want to speed up the process you
can add bacteria to the system. Most of the bacteria that you add will colonize
the filter, colonize the gravel, and outcompete the nuisance bacteria that’s colonized the
water column for nutrients. You can also use a UV sterilizer. A UV sterilizer will prevent the bacteria
from reproducing because bacteria have a very short life. As they reproduce, when they’re exposed to
ultraviolet light, it causes a lot of mutations in their genetic sequences and they can’t
reproduce. You’ll have a very sterile environment within
a few days, so anything living in the water column will be eradicated. You’ll have crystal clear water within three
to five days depending on the size of the tank and the size of the UV sterilizer. So UV sterilizers are great for curing cloudy
water. If the water is clouded from particulates
you can use a coagulating agent such as Acurel F or anything that’s made for cloudy water. What it does is it clumps a lot of the particulates
in the water and allows the filter to extract them out of the water. Otherwise, just doing your water changes,
making sure the filter’s clean, cutting back on feeding usually will allow the tank to
balance out and get clear again. If you think the water’s cloudy but it really
has a greenish tint when you look through the side the greenish water is caused by algae
not by bacteria. That can be controlled by cutting back the
available light. Usually sunlight or keeping the light on 24
hours a day will result in like a milky, cloudy, greenish appearance to the tank. You want to decipher between green water and
cloudy, milky water. Cloudy is usually bacteria driven. Green is usually algae driven.

36 comments on “How to Fix Cloudy Fish Tank Water | Aquarium Care

  1. Thanks for the easy explanation. Just got a 10 gallon and have that milky sort of look, so i turned off my LED strip at the bottom of the tank. I may go out and get a UV Sterilizer now. Any brand suggestions?

  2. I have a 55 gallon tank ive tried everything! Water clarifyer 50% water changes ive done this for about a month and nothing has helped… HELP

  3. I am a new owner and I have a 20 gallon with only three fish, the first week was fine but now it is super cloudy. I do weekly water changes and I treat my water by idk what to do. Help!!!!!!!!

  4. I put algae wafers in my tank which causes it to be cloudy, is there anyway I can stop it from happening? It smells horrible

  5. I want it to be somewhat foggy. It’s supposed to look like the bottom of the Atlantic Ocean, clear water won’t look like that. Is there a way to safely make it foggy?

  6. we have a spring and when it rains it gets cloudy water and i put clear water additives and a filter in to help but it was so bad i kept my fish out of the tank till it got better.

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