Freshwater Tank Temperatures & Bacteria
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Freshwater Tank Temperatures & Bacteria

This is a discussion on Freshwater Tank Temperatures & Bacteria within the Freshwater Chat forums, part of the Aquarium Related Chat category; Just wondering . . . How cold can the tank water be WITHOUT killing off the "good" bacteria in the ...

  1. #1
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    Question Freshwater Tank Temperatures & Bacteria

    Just wondering . . .

    How cold can the tank water be WITHOUT killing off the "good" bacteria in the filter, etc.

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    Forum Guru arash53's Avatar
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    The temperature for optimum growth of nitrifying bacteria is between 77-86 F (25-30 C).

    Growth rate is decreased by 50% at 64 F (18 C).

    Growth rate is decreased by 75% at 46-50 F.

    No activity will occur at 39 F (4 C)

    Nitrifying bacteria will die at 32 F (0 C).

    Nitrifying bacteria will die at 120 F (49 C)

    Nitrobacter is less tolerant of low temperatures than Nitrosomonas. In cold water systems, care must be taken to monitor the accumulation of nitrites.

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    With the little heat wave we are having this week, I wanted to add some "cooler" water through the H.O.B. filter to bring the temp down a degree or two without disturbing the bacteria (too much). Thanks for the info.

    Last edited by Mick2016; 06-20-2018 at 05:42 AM.
    arash53 likes this.

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    Forum God dino's Avatar
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    I wouldn't do that personally but arash sure has some good info
    500 gallon plywood tank
    230 motor stingray breeding tank. led lighting, dual sump sump,and drip system
    150 gallon saltwater mixed reef.
    150 gallon African cichlid
    90 gallon fahaka puffer tank
    75 gallon flowerhorn tank
    55 gallon axolotle tank
    loads of guppies and shrimp tanks

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    We had a few days of 30+ out here in The Fraser Valley. I wasn't looking to make fish soup!

    All kidding aside, I prefer to keep the tank water between 24-26. It was maintaining 28. While not a "fatal" level, I would like to not have it pushing 30 whenever possible.




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