Proper water changes

Discussion in 'Goldfish' started by fantails, Jan 5, 2010.

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  1. fantails

    fantails Plankton

    Joined:
    Jan 1, 2010
    Messages:
    21
    Location:
    Ontario, Canada
    Hi. I want to know what is the proper amount of water that should be changed weelky on a 40 gallon tank with 3 fantails in it. I also have a 15 gallon with 1 fantail. Thanks Mike
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  3. Telgar

    Telgar Snowflake Eel

    Joined:
    Jun 20, 2009
    Messages:
    2,390
    Location:
    Ft Washington, MD
    general rule of thumb is 10% weekly so about 4 gallons a week for the 40 and 1.5 gal for the 15.
  4. lunatik_69

    lunatik_69 Giant Squid

    Joined:
    Jul 10, 2007
    Messages:
    7,934
    Location:
    Miami, FL

    Yup, he's right. Anywhere between 10-15%.



    luna
  5. jewels_04

    jewels_04 Astrea Snail

    Joined:
    Dec 30, 2011
    Messages:
    34
    Location:
    northwest indiana
    I changed about 15% in my 30 gallon with 2 goldfish, but 10% is about average for a weekly water change as long as your fish are doing ok and the tests are good.