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Thread: [Classic] pH and temp erratic fluctuations at night

  1. #1
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    [Classic] pH and temp erratic fluctuations at night

    Below are some screenshots of what I mean. It seems to only have issues between 8pm and 8am, which the second image should show pretty well. Nothing is set to turn on or off at those hours, and lights are LED 11am-9pm and T5s 1pm-6pm. A few months ago I had separated the probe wires from the rest of the wires, that seemed to help, but eventually, it came back and only at night. Thoughts?




  2. #2
    Frequent Contributor zombie's Avatar
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    Are the probes really close to a heater?

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    Probes are in my overflow, and the heater is in the sump.

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    Frequent Contributor zombie's Avatar
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    Do you perhaps have a 2 heater setup where they take turns and one of them runs only in that rough window? If so, make sure that wire isn't next to and parallel to the probe cords and check for stray voltage.

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    Nope, just the one heater, both overlaid below.


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    Frequent Contributor zombie's Avatar
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    What about a refugium light? Is that perhaps on during the noise issue?

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    Fuge is on 24h

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    Frequent Visitor bigjim's Avatar
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    Quote Originally Posted by penguinsix View Post
    Probes are in my overflow, and the heater is in the sump.
    Does your return pump slow down at night resulting in less water going down your overflow possibly partially exposing your probes to air?

  9. #9
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    Quote Originally Posted by bigjim View Post
    Does your return pump slow down at night resulting in less water going down your overflow possibly partially exposing your probes to air?
    Nope, it's a single speed pump, so should be the same all day.

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