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  1. Sat, 4th Sep 2010, 10:58 AM #1
    BSJF
    BSJF is offline Web Member
    Join Date
    05-08-2009
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    NE San Antonio
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    Default ORP dropping???

    My tank's ORP is typically over 400.
    A few weeks ago I noticed it was in the mid 300s. This morning it was down around 300. Today post water change it is about 290.

    I need help determining the possible cause.

    ORP Probe on Aqua Controller gone bad?
    Tank trying to crash?
    ?????

    The 150g tank has been established for just over a year.
    Last week I did a 40 gallon water change w/Red Sea salt.
    Today I did a 25 gallon water change mix of IO and RC.

    Alk 180 ppm
    Calc 400 ppm
    Mag 1350 ppm
    Temp 78
    pH 78.5
    Nitrates 0
    Phosphate 0
    Salinity 1.026

    Thoughts, suggestions?
    Last edited by BSJF; Sat, 4th Sep 2010 at 11:04 AM.
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