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Discussion Starter · #1 ·
My friend has a non-planted tank and has in stock 2 goldfish and 1 koi in a 20 gallon. They do 20% water changes every 2 weeks and replace their filter. What else could be done to fix the white cloudy water?
 

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Discussion Starter · #5 ·
How long has the tank been set up? It sounds like a bacterial bloom caused by the tank not being fully cycled. Only time can clear it up properly, though you can use a micron canister filter or a UV sterilizer to help the process along a bit.
They have had the setup for a year or so. Also they have a hang on filter that seems to be right size for the tank, way bigger than what I have at home. There is no overfeeding as well.
 
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