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Thread: High Alkalinity

  1. #1
    Senior Member manster's Avatar
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    Question High Alkalinity

    Well it had to happen. After having the Alkalinity level off to 10.6 after it jumped to 11.6 , this morning when I did the test after 3 weeks, my Alkalinity level was up to 12.6!
    The tank has been pretty stable and the only reason I did the tests was because I noticed that my Aussie Elegance had not opened up. All other params are normal. SG -1.025 TEMP 79 F Nitrates 5 CALCIUM 410 MAG 1300 PH 8.2. Last 25% monthly water change was done yesterday.
    Any idea why it went up just like that and how can I bring it back down. Ideally if I could I would like to run around 9.

  2. #2
    liv
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    Former Moderator liv's Avatar
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    alk at 12.6 is fine.. its fluxuations are aren't good.
    how are you raising the CA ?

    moving.. so temporarily out of SW :b8:
    planning next tank, possibly 60x30x20 on 2x plasma.
    updated: 2011/05/30

  3. #3
    Senior Member manster's Avatar
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    Question High Alkalinity

    liv,

    I have been using an Aquacare Calcium Reactor since the tank was 3 months old. Have it running twice a day for an hour each time but have increased the run time to 3 hrs each twice a day mainly because I have added about 5 Acros and some Montis. For a 5 month old tank (Second Setup - My first setup ran for about 6 months but had to dismantle the tank because of a flood in the basement from the Dishwasher in the Main Floor) most of my LR is already covered by coralline.
    Isn't 12.6 high? A lot of people were telling me that I should be running between 8 and 9 but I do realize that it is different for every tank and at 10 - 10.6 all the corals in the tank were thriving. I had it steady at 10.6 for a good 4 months but then my Calcium level was at 440.

    I accidentally deleted my signature while I was editing it so here are my tank details:

    180G 6' x 2' x 2' w/ 65G Sump
    300 LBS. mixed LR, 3" Sand Bed
    Dart Pump for Closed Loop, Iwaki 55 for Return
    Aquacare Model II Calcium Reactor, 90 GPD RO/DI, ATS
    1/2 HP Chiller, External Bubble King Clone Skimmer (350 G),
    55 W UV Sterilizer, Carbon Reactor, Phosphate Reactor
    3 x 250 W DE MH 20K Geisemanns, 2 Banks of 80 Blue LEDS,
    4 x 39 W Aqua Science 22Ks, 2 x 39 W 15K Daylights, 2 x 39W Fiji Purples

  4. #4
    liv
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    you did any water changes ? not all salt batches are equal.. he he
    Tons of people keep their alk that high.... odds are its going to stay up now.

    moving.. so temporarily out of SW :b8:
    planning next tank, possibly 60x30x20 on 2x plasma.
    updated: 2011/05/30

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    Quote Originally Posted by liv View Post
    you did any water changes ? not all salt batches are equal.. he he
    Tons of people keep their alk that high.... odds are its going to stay up now.
    I have a question for your question
    could it be a RO/DI, Di getting old therefore tap water very hard
    gives you a high KH after adding salt?
    90G + 40

  6. #6
    liv
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    your ro would have to be really really shot.. / broken to allow such a thing... but ya.. its a possibility.

    but main thing is stability.

    moving.. so temporarily out of SW :b8:
    planning next tank, possibly 60x30x20 on 2x plasma.
    updated: 2011/05/30

  7. #7
    Senior Member manster's Avatar
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    Question High Alkalinity

    captnphil
    I just checked my SpectraPure RO/DI and water coming out of it is fine.

    liv
    As a matter of fact I just did a 25% water change on the the 2nd, which is a monthly thing for the tank. I lost my Australian Elegance. Alkalinity is now down to 12.0 after adjusting the reactor (more effluent, less bubbles), Is there nothing in the market to slowly bring down the Alkalinity?

  8. #8
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    What's the alkalinity of your newly mixed salt water??

    When you get ALK that high you definitely don't want to keep it climbing. You will get to a point where it will precipitate out as calcium carbonate and that looks like a snowstorm.

    IMO I would just reduce water changes for a bit to see if it was the water change that increased it.

    Do you supplement ALK at all?

  9. #9
    Member Chix's Avatar
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    12.5 is alright to be honest, as long as you can just keep it stable like that. Fluctuations mean that there's something wrong going on with your water. If you can keep it at 12.5, you shouldn't have any worries.

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