Density

Discussion in 'General Discussions and Advice' started by Rod, 14 Sep 2007.

Voter count: 27
?

What temperature is your tank?

Poll closed 28 Sep 2007.
  1. 22 C

    0 vote(s)
    0.0%
  2. 24 C

    3 vote(s)
    11.1%
  3. 26 C

    12 vote(s)
    44.4%
  4. 28 C

    9 vote(s)
    33.3%
  5. Other

    3 vote(s)
    11.1%
  1. Rod

    Rod

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    Hi, there are so many members with spectacular aquariums out there. The question is two fold.
    What density? What temperature?
    I was quite surprised in another context, Allan was running at 27 C.
    Perhaps a poll?

    Perhaps I should have said Specific Gravity.
     
    Last edited: 15 Sep 2007
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  3. Reaper

    Reaper

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    I've got my heater set on 27, and it stays constand during the day. At night time tho it tends to drop to about 25.5 to 26.

    I've tried it a couple of weeks ago, to see what the inmates and corals will do, because apparently you get better growth at around 28, and thus far all the inhabitants seem to like the higher temp.

    I won't push to 28, that's playing a bit too close to the edge (30 - all start to die).
     
  4. Mekaeel

    Mekaeel Moderator MASA Contributor

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    Chiller set at 25.sits around 25 - 25.5 and SG 1.025
     
    Last edited: 14 Sep 2007
  5. jacquesb

    jacquesb Retired Moderator

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    Hiya Rod. I have my 300watt heater set to 30 degrees in my sump (only place where I have a heater) in the same compartment as my return pumps (x2) (and phosphate reactor pump/return).

    My tank temperature currently stays at +-25 degrees celcius. The ambient temp in my livingroom is quite cool in Cape Town, at this stage of the year. I will most likely disconnect my heater as soon as the ambient temp starts to rise, causing a rise in my tank's temperature.

    If I set my heater any lower, then the tank's temperature is lower.... I seem to have a heat loss of +-degrees celsius between the sump compartment's water, up the return pipe, and into my tank...... (also take into account the heat increase of the lights..... and the heat loss into the open top area, due to evaporation)....

    My SG runs at: 1025
     
    Last edited: 14 Sep 2007
  6. calvin

    calvin

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    im sitting between 23.5 and 24.5
     
  7. Alan

    Alan Admin MASA Contributor

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    Hi Rod, when you say density i assume you mean SG. Okay i run SG at 1025 and temp at 27 in winter and about 26 in summer.
     
  8. Midasblenny

    Midasblenny

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    SG 1.025 and temp 26deg celsius but having no chiller the temp rises to 28 on hot days.
     
  9. Reef Maniac

    Reef Maniac MASA Contributor

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    Hey guys,

    It's important to quote the SG AND temperature at which the SG is read, as SG varies with temperature.

    I keep my salinity at 35 ppt (parts per thousand) - that is, at a SG of 1.026 at 26 degrees C.

    The following interesting article will shed more light on this:

    http://www.advancedaquarist.com/issues/jan2002/chemistry.htm


    Hennie
     
    Last edited: 15 Sep 2007
  10. ed

    ed

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    i keep mine at around 1.025 at 28 deg
     
  11. millepora

    millepora

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    1.024 @ 26 deg
     
  12. ShaneW

    ShaneW

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    1.025 @ 27.5'C ... I used to keep the temp at 26 but it would get to 29/30 in summer so I raised the temp to 27.5 so it wouldn't be too much of a shock for the system in summer.
     
  13. Muz

    Muz

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    1.026 @ 25.5 ( evenings ) to 26.5 ( mid day with MH on )

    Muz
     
  14. Frank

    Frank

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    1.024 @ 26 degrees
     
  15. Rod

    Rod Thread Starter

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    Hi I had to clear this up for my own information.

    Density = Mass / Volume

    Specific gravity is the density of a substance divided by the density of water. Since water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is the same number as density but without any units.
     
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