high kh

Discussion in 'General Discussions and Advice' started by dropzone newbee, 17 Nov 2010.

  1. dropzone newbee

    dropzone newbee

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    afternoon reefers

    my kh has always been hanging around the 6 ish mark !! pretty much always battled to keep it there !
    i have not buffered for at least 4 weeks now and suddenly the kh is 10-11 !!
    what could be the reason for the sudden jump ?
    it has been there now for about 1.5 weeks already and everything in tank is thriving

    other parameters spot on
     
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  3. mariusmeyer

    mariusmeyer

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    Either its a faulty test kit or you added something. What tank maintenance have you done between the low and high reading? Are you adding anything to your topup water?
     
  4. OP
    dropzone newbee

    dropzone newbee

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    its using 2 different test kits
    i have done nothing different besides the normal water change every 10 days and i use my own R.O water :(
     
  5. Tobes

    Tobes Retired Moderator

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    Did you change salt brand?
     
  6. mariusmeyer

    mariusmeyer

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    How can you not buffer for 4 weeks? Alkalinity is one of the things that drops on a daily basis. So if you dont dose on a daily basis to keep it stable then it should only drop. My big tank with mainly soft corals drops by 0.25dkh per day and that is a very small amount compared to tanks with say SPS in. My nano dropped by 0.5dkh per day during the time of massive coraline growth.

    What is your magnesium level like? A low mg level will prevent you from raising calcium and alk levels. What size waterchanges did you do and what salt brand did you use?
     
  7. mariusmeyer

    mariusmeyer

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    Mabe a low mg level could influence the readings in the alk kit? That is if it is low.
     
  8. OP
    dropzone newbee

    dropzone newbee

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    no sir

    absolutely changed nada

    very odd
     
  9. Manic

    Manic Moderator

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    I've read about a chemical imbalance causing this. Low magnesium levels will stop corals from being able to process kH and calcium. Maybe this is your problem, have you tested your magnesium levels?
     
  10. OP
    dropzone newbee

    dropzone newbee

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    thanks , but i run a reactor which normally keeps the parameters in line !
    same salt ,, same test kits !!
     
  11. Manic

    Manic Moderator

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    Thats what I thought until I tested my magnesium. Was really low, just added more NeoZeo to the calcium reactor
     
  12. OP
    dropzone newbee

    dropzone newbee

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    k
    thanks for input guys
    will check mag levels tonight
     
  13. Achilles

    Achilles

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    kh might rise if calcium has dropped significantly i find, maybe you had calcium precipitate out?

    i also find if i raise calcium with say calcium chloride then my kh drops by 1-2 for every 30ppm rise in calcium
     
    Last edited: 18 Nov 2010
  14. OP
    dropzone newbee

    dropzone newbee

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    thanks achilles
    the calcium was at 400 at the time , so think thats fine
    having the mag' tested with a new test kit today
    hope thats the problem
     

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