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  1. #1
    Senior Member ALRHA's Avatar
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    Question Specific Gravity

    What is the optimal level to keep the SG in our tanks?
    What are the advantages/disadvantages of higher/lower levels?

    From what I understand, "regular" tanks maintain level at or near 1.023 while "Reef" tanks should keep it closer to 1.026

    -Albert

  2. #2
    Senior Member tang_man_montreal's Avatar
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    Would be cool to see a poll on this...
    I keep mine at 1.024-1-025... But ofcoarse, this is going by a cheap hydrometer which are notorious for being off. Ideally people should look into refractometers... IJO's looking into this already.
    I am Homer of BORG... Prepare to be..OOOO!! DONUT!!!!!!

  3. #3
    Senior Member ALRHA's Avatar
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    tang man, from your keyboard to my screen, look at the next thread.
    your wishes have come true even as you wished them.
    he he.
    Albert
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  4. #4
    Senior Member ALRHA's Avatar
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    Poll is in the "Polls" Forum.
    Albert
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  5. #5
    Senior Member tang_man_montreal's Avatar
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    :thumb:
    I am Homer of BORG... Prepare to be..OOOO!! DONUT!!!!!!

  6. #6
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    i use a refractometer and i keep mine at 1025

  7. #7
    Senior Member ALRHA's Avatar
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    anyone have any idea as to the pros and cons (i guess chemistry wise)?
    Is it worth getting a refractometer over a hydrometer?
    Albert
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  8. #8
    Senior Member tang_man_montreal's Avatar
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    Hydrometers are KNOWN to be off between .001 to .009 high and low... Further more, most hydrometers are calibrated to 78 degrees. If you're testing water that is warmer than that, you're actual specific gravity will be higher than what is depicted by the hydrometer.
    Then add the possibilty of calcium deposits on the needle, airbubbles under the needle, and you've got your problem right there....

    Whereas Some of the newer refractometers have ATC (Automatic Temperature Compensation), you don't have to worry about the temperature aspect, and you'll always know that you have a real reading.

    Having a specific gravity of 1.026 or 1.024 when you're actually shooting for 1.025 isn't the end of the world for many people, and those people can live with plastic hydrometers. HOWEVER... How do you know that you're not off by more than that? Furthermore, when needing to treat a fish for ich IN A HOSPITAL TANK using hyposalinity (a specific gravity of 1.009), hydrometers are useless, as they are not reliable enough to read that low...

    Hyposalinity is a whole other discussion though...

    I hope that helps.
    I am Homer of BORG... Prepare to be..OOOO!! DONUT!!!!!!

  9. #9
    Senior Member ALRHA's Avatar
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    yeah, i dont see it to be such a big deal if its not exact. just like to know around where it is. Besides, from what I understand it is actually the salinity that we are interested in, correct? The SG is just another indication of where the salinity likely is, but i assume there are plenty of things that can affect the SG (in addition to temperature, the chemical breakdown of the solution). If i end up getting a PinPoint Salinity monitor, then i guess that would solve that problem.

    now i'm just waiting to see if anyone has any insights on the practical difference between the higher or lower levels.
    I would think the lower levels leave less work to the fish as far as respiration (because the gradient is less) but more work by way of floatation. I would think that this would also have an effect on the oxygen concentration in the water as well as chemical reactions and absorbtion rates. While I do love chem and bio, i did not major in them at the end. so those who know better can help out here.
    Albert
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  10. #10
    Senior Member mouse6196's Avatar
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    1.025....works for me:
    The only thing two reef keepers will agree on, is what the third reef keeper is doing wrong!

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