specific gravity

Discussion in 'Water Parameters and Additives' started by lindsay pollard, 19 May 2009.

  1. lindsay pollard

    lindsay pollard pipefish

    Joined:
    23 Dec 2007
    Posts:
    246
    Likes Received:
    2
    Location:
    PLETTENBERG BAY
    Hey guys i am batteling to get my S.G down im standing at 1030 and its not budging,
    what should i do advice please.
     
  2. AdS Guest




    to hide all adverts.
  3. jacquesb

    jacquesb Retired Moderator

    Joined:
    29 May 2007
    Posts:
    17,868
    Likes Received:
    69
    Location:
    Cape Town
    Hi Lindsay.... Remove at least 20% of your tank's water (you don't have to dump the salt water if it is still "fresh"), and replace this with RO water....
    Repeat this after 2 or 3 days, if your salinity is not perfect..... BUT, you will HAVE to wait 2 to 3 days inbetween......

    And no - this will NOT do anything to your lifestock....
     
  4. lindsay pollard

    lindsay pollard Thread Starter pipefish

    Joined:
    23 Dec 2007
    Posts:
    246
    Likes Received:
    2
    Location:
    PLETTENBERG BAY
    thanx for the quick response Jacques ill try this and hope all comes back to norm
     
  5. jacquesb

    jacquesb Retired Moderator

    Joined:
    29 May 2007
    Posts:
    17,868
    Likes Received:
    69
    Location:
    Cape Town
    Good show Lindsay! No probs man! Guaranteed it will "come back to normal" soon! Good luck mate!
     
  6. Mike

    Mike Retired Moderator

    Joined:
    12 May 2007
    Posts:
    7,859
    Likes Received:
    30
    Location:
    the Motherland
    Firstly i'd check your measurement, just incase your refractometer is wrong, then whatever you do, do it slowly, just as you'd acclimatise a fish.
     
  7. Tony

    Tony

    Joined:
    23 Aug 2008
    Posts:
    4,093
    Likes Received:
    68
    Location:
    Honeydew, Johannesburg
    How are you testing the salinity?
     
  8. Monti

    Monti

    Joined:
    22 Sep 2008
    Posts:
    811
    Likes Received:
    38
    Location:
    Durban
    I think this is a little drastic- 20% is a fair bit to just replace with RO. I would suggest a slower lowering of the water using either a smaller percentage, or replace 20% with water with a SG of say 1.015 or something to gradually lower the salt content to within the normal range.

    I do however agree that you first need to just check your salinity against another refractometer
     
    Mekaeel likes this.
  9. Mekaeel

    Mekaeel Moderator MASA Contributor

    Joined:
    8 May 2007
    Posts:
    24,229
    Likes Received:
    127
    Location:
    Point Waterfront Durban
    Dont forget to calibrate your refractrometer before testing.
    I agree with Monti. Do water changes with a lower SG not just plain RO. You will be knocking your water parameters off causing stress to livestock. IMO
     
  10. Tony

    Tony

    Joined:
    23 Aug 2008
    Posts:
    4,093
    Likes Received:
    68
    Location:
    Honeydew, Johannesburg
    Do you know how to calibrate a refractometer?
     
  11. ben lloyd

    ben lloyd

    Joined:
    23 Jun 2008
    Posts:
    1,344
    Likes Received:
    3
    Location:
    kzn dundee
    easy Tony take distiled water that must read 0 and adjust your refractometer to 0 turn the Little screw on the top bay turning it in our out:thumbup:
     
  12. martin

    martin Reef Adict

    Joined:
    8 Aug 2007
    Posts:
    397
    Likes Received:
    4
    Location:
    Faerie Glen Pretoria
    Are you perhaps using salt water to top-up you system?
     
  13. jacquesb

    jacquesb Retired Moderator

    Joined:
    29 May 2007
    Posts:
    17,868
    Likes Received:
    69
    Location:
    Cape Town
    You guys KNOW of course that salinity in a marine tank can be lowered FAR QUICKER than increased, right?

    Or have you recently seen a HUGE amount of dead coral pieces and dead fish on the shores, after huge storms, and after rivers have come down in floods? (in the tropical and sub-tropical areas where there are reefs)?

     
  14. Monti

    Monti

    Joined:
    22 Sep 2008
    Posts:
    811
    Likes Received:
    38
    Location:
    Durban
    Yes, but that is an open system whereby the fresh water gets diluted fairly quickly. I personally think that in smaller systems it is best to be as stable as possible- our tanks are not the ocean. Taking out 20% of the tank water and replacing it with RO will throw all the other parameters like calcium and alkalinity out of order which would negatively affect your livestock.
     
Recent Posts

Loading...
Similar Threads - specific gravity Forum Date
good little vid on salinity & specific gravity Water Parameters and Additives 21 Nov 2011
Specific Gravity Water Parameters and Additives 17 May 2007
DIY - Help with wire specifications Anything DIY Related 16 Jul 2013
Phospha-Guard Granulated Iron Media was specifically designed to absorb phosphat... JungleAquatics.NET BLOG 12 Oct 2012
finding specific threads Forum Suggestions and Feedback 18 Nov 2008
Steel frame specifications Beginner Discussions 3 Sep 2008
How to find specific pics General Images 25 Jul 2008