water quality for hard corals

Discussion in 'General Discussions and Advice' started by Ash, 30 Mar 2010.

  1. Ash

    Ash Coral biologist

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    Hi all.

    Whats the best pH for hard corals (an exclusively acropora tank)
    I've been keeping it at 8.1 to 8.4 but have been told thats too high and should lower it to around 7.8.
    Any ideas which is right?
    Thanks
     
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  3. Midasblenny

    Midasblenny

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    Bad advice i`d say, 7.8 is too low
    With pH stability is more important than the reading, aim for 8.1 to 8.6 but with no or little daily fluctuations.
     
  4. ziyaadb

    ziyaadb

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    what Midas said
     
  5. Moolis Moolman

    Moolis Moolman Pet Stop SA Sponsor

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    We have a SPS system - the frags even grow while they wait for a new home:thumbup:

    And if the PH are lower than 8.1 they grow slower:p

    But PH are not the only parameter to watch, because if your calcium and alkalinity is correct the PH should stay above 8.1 and then Iodine, Magnesium, phosphates and nitrates should all be monitored as well.

    If you monitor them all and keep their levels correct a SPS aquarium is great, skimp on these and a SPS aquarium COULD become a nightmare:(
     
  6. Ash

    Ash Thread Starter Coral biologist

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    Thanks!
    Another question though.
    I recently used pratley's putty to glue about 40 acropora frags to live rock and my phosphate levels shot up from 0.00086 to 0.54455 mg/l. all the frags were in the tank before I glued them and nothing else has been added/changed.
    Could this be because of the putty or stress of the coral? I don't know of a stress response which results in raised phosphate levels. Unfortunately this along with a very unlucky temp spike from 25C to 28.4C over the weekend has resulted in 3 deaths so far and some very unhappy and pale coral. I have now added a phosphate reactor and will be check water quality again on thurs.
     
  7. Manic

    Manic Moderator

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    How did you measure your phosphates to that many decimal places. Do you have an electric phosphate pen, if so where did you get it as I can only find them on overseas websites...
     
  8. Ash

    Ash Thread Starter Coral biologist

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    A friend in the aquaculture business. Does all my water quality once a week. Lekker guy
     
  9. Manic

    Manic Moderator

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    You got me all excited there. Finally thought that digital phosphate pens were in the country...
     
  10. Moolis Moolman

    Moolis Moolman Pet Stop SA Sponsor

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    pens

    What do you think a pen would cost?
     
  11. Manic

    Manic Moderator

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    I've seen them overseas for around $70, which is cheap if I never have to buy a phosphate test kit ever...
     
  12. vatso

    vatso

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    Bic is much cheaper then Montblanc :razz:
     
  13. Midasblenny

    Midasblenny

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    Interesting, i`ll have to do some tests on pratleys putty and see what i get
     
  14. Manic

    Manic Moderator

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    Here's a pic:

    [​IMG]

    Hanna Instruments has recently come out with their new sub $50 Checker phosphate (PO4) colorimeter. It has yet to make much of a splash in the marine aquaria world, but we have a feeling that will soon change after Hanna confirmed with us that this colorimeter will work with saltwater water samples.

    Hanna Checker Colorimeter:
    Works in Saltwater
    0.0-2.5 ppm range
    0.01 ppm resolution
    Offers accuracy of +/- .04 ppm, +/- 4% of reading @ 25C
    Powered by (1) AAA Battery
    Auto-shutoff after 2 minutes
    10ml glass cuvettes

    The hobby’s go-to phosphate colorimeter has long been the Hanna HI 93713 which will set you back roughly $170 USD. When comparing this to the $49 Hanna Checker it seems silly to even consider the HI 9373–they both offer the same resolution, accuracy and range, while the new Checker costs 4 times less.

    The biggest con for the HI 9373 has always been price and accuracy. $170 is a lot of money to pay for water readings that may be 0.1ppm or 0.5ppm. The Checker’s +/- 0.04ppm range is equally large, but the pricetag is drastically lower. If tests are done in a controlled and repeatable manner, this affordable colorimeter will allow aquarists to easily benchmark their phosphate levels without breaking the bank or pulling out a color wheel. Current pricing is $40 at various online stores or $49.50 with free shipping direct from Hanna. Meanwhile, reagents are priced at $8.99 for 25.

    Despite the praise that colorimeters get, remember they are not necessarily more accurate than titration kits. Still, considering the lack of options in low range phosphate testing this is a welcome addition to an aquarists testing arsenal.

    http://glassbox-design.com/2010/hanna-checker-po4-colorimeter/
     
  15. Moolis Moolman

    Moolis Moolman Pet Stop SA Sponsor

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    But I still think Blanc de noir is better:1:
     
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