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Once every fortnight, depending on how many fish in your tank. However, the filter should be cleaned only twice a year. This is because the 'good bacteria' in the filter would be washed out when cleaning.

Do not use any chemicals in your tank when cleaning. Except Water conditioners or Water agers. They are important and should be used every time you do a water change. Also. When doing a water change, Only take out a quarter of the tanks water
every week

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6y ago
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14y ago

almost every other day. i had one and i left it un clean for 4 days and it stuck to the side of the tank.

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13y ago

Well about 3 times a week but if your tank has algae or the water is clouded then it must be cleaned,or the water must be replaced.

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11y ago

weekly

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Q: You have 3 goldfish how often should you clean the 1.5 gallon tank?
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How often should you clean a goldfish tank with 4 goldfish in it?

Once a week :))))) i have experience


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Every Second! Gold Fish are Very messy and need a filter to keep them alive. I suggest you put your Goldfish in a pond. Make sure there is more than one, Goldfish have friends just like you and me. Or you could get a 20 gallon tank (the tank has to be big enough so goldfish can grow up to 10 inches long WITH a filter. okay long story short, one inch per fish needs at least a gallon!


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