Salinity way way off-25 ppt

Discussion in 'Reef Chemistry' started by L/B Block, Sep 1, 2017.

  1. L/B Block

    L/B Block Supporting Member

    So through a compound of errors, I have found that the current salinity in the tank is 25 ppt (by way of refractometer with calibration solution). I think that this resulted by
    1) the water from the last water changed was not well mixed
    2) salinity probe on apex way off (by almost 10!)

    What is amazing is that all the fish and corals seem to being doing ok for the most part (at least nothing has died)

    So I have a new batch of water (35 ppt) was going to swap out 10 gals today over 10 hours (via APEX DOS),
    Prob another 10 tomorrow,
    And then another 10 Sunday hopefully to get salinity back on track. Although it will raise it only marginally (according to online calculations 30 gal replacement would go from 25 ppt to 28.5)
    From there possibly 2-3 gallons a day
    It's 85 gal by volume.

    I could increase it to 40 ppt I suppose and then get it back up to 30 ppt.

    Any suggestions..


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    DEATH BY SNU SNU Supporting Member

    Do it slowly...I can't stress that enough....I've had whole copepod and bristleworm populations die off when I added new water too fast...
    iCon likes this.
  3. L/B Block

    L/B Block Supporting Member

    Concerned about that too. Hence one gallon per hour

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  4. roostertech

    roostertech reef noob

    Not sure how much water does your tank evaporate, but an easy way to raise salinity is to shut off your ATO and top off with salt water.

    As for salinity probe, recalibrate it again, make sure the pouch is at tank temperature before you start. Also enable temperature compensation or it will be off by around 2.
  5. Bruce Spiegelman

    Bruce Spiegelman Supporting Member

    If you need calibration fluid and are in the East Bay I can give you some.
  6. kinetic

    kinetic Webmaster

  7. L/B Block

    L/B Block Supporting Member

    Thanks Bruce- just got a years supply from BRS with ph solution too! I am stocking up!

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  8. Coral reefer

    Coral reefer President

    Just top off with salt water until it's right.
    iCon and L/B Block like this.
  9. L/B Block

    L/B Block Supporting Member

    Not a bad idea. Off by two-not great.
    But it's seriously off my almost 9 ppt right now.
    Going to calibrate but also waiting for water to return to 77 degrees. With the heat, it's bumping to 78. Going to try and be exiting as possible

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  10. Coral reefer

    Coral reefer President

    Seriously, you said everything is ok. Don't rush it. You want to raise salinity slowly. Lowering it is much easier.
    DEATH BY SNU SNU likes this.
  11. L/B Block

    L/B Block Supporting Member

    Due for a water change anyway. So will just swap out 10 gallon today (slowly -the DOS goes 750 ml at a clip 4x a hour over 10 hours) And then will simply go back to 1.1 gallons a day with DOS.
    There is really is not a whole lot of evaporation in general so will leave ATO as is.
    From there it should slowly return to its normal self.

    That should suffice?

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  12. mattcoug

    mattcoug Guest

    My 2 cents - I've never killed anything from too low salinity, but I have killed from trying to change to fast. Completely agree with the above posters to simply let evaporation bring it back up to 35, just top off with only salt water.

    Also on the apex probe - They have been 100% reliable for me once I did a couple things:
    • must be in constant flow
    • must not have light on them, think algae growth
    • must not have ANY microbubbles in the water, think skimmers/etc, put them upstream
    • keep snails, stars, aiptasia, etc from crawling and growing in the probe
    I have 3 tanks and a mixing station automated by salinity probes for ~4 years.
  13. roostertech

    roostertech reef noob

    Forgot the last bit, you will need to enable temperature compensation for it to completely line up. From the manual:

  14. L/B Block

    L/B Block Supporting Member


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  15. L/B Block

    L/B Block Supporting Member

    Good to know this...thanks

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