Corals use of minerals

Discussion in 'Water Parameters and Additives' started by CameL, 5 May 2015.

  1. CameL

    CameL

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    Hi guys,

    When people talk about corals getting retarded growth when parameters are out of whack, what does that mean?
    Do your corals stop growing and therefore stop the intake of minerals?
    Can coral growth stop when you parameters are out of line due to one mineral, im talking the major minerals i.e. alk/ca/mg. So if ca and mg are correct according to "normal" levels but alk is too low, will corals stop growing, and if you correct alk will coral growth start again?
    Can this be used to controllably slow coral growth while still keeping everything healthy?
    I understand that long term low alk levels are not good. Just a thought running through my head after measuring parameters and one long day at the office.

    I hope i explained myself clearly enough.
     
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  3. jimilutz

    jimilutz

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    I would not ease off Alk. If you want to slow down stony corals, decreasing the calcium will work but why not just let them grow and frag them? I dont know how you slow down softies though.
     
  4. mariusmeyer

    mariusmeyer

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    Why would you want to slow down coal growth? Best is to keep the parameters where they should be and let the corals do what they are supposed to do...grow.
     
  5. 459b

    459b Moderator MASA Contributor

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    Unfortunately it's not that simple with corals. There is the theory that things growth is limited by the nutrient in the lowest concentration, which is fairly easy to demonstrate in plants.
    With reef tanks the parameters are linked, so limiting kh will upset other levels like pH.

    Is there a reason you want to limit coral growth?
     
  6. CameL

    CameL Thread Starter

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    Well no, my situation is a bit different. My thought patter occured when i noticed a steady decline in alk, ca and mg remained stable, so i dosed for alk on the upper limit of the supplement. i measured about 36 hours later and noticed that it had infact gone down. yet ca and mg remained the same. so it got me thinking that the corals were limited by an inbalance in major minerals. and the moment i pushed them into balance again they used all the available and more. don't know if i make sense.
     
  7. Nemos Janitor

    Nemos Janitor

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    You say Mg is stable. What is the level?
     
  8. mariusmeyer

    mariusmeyer

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    What is your ca and mg levels? a low mg level will prevent you from raising alkalinity. Also if your calcium is too high, you will drop alkalinity by adding calcium. I don't think the corals have anything to do with it, I think you just have a imbalance that is preventing your efforts
     
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  9. CameL

    CameL Thread Starter

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    mg = 1400, ca = 400, alk =7.7 but it's gone down from 8.4 over the period of a month
     
    Last edited: 5 May 2015
  10. Nemos Janitor

    Nemos Janitor

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    Salinity?
     
  11. CameL

    CameL Thread Starter

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    S=35 with refractometer

    It's 8.1 now according to the salifert test kit
     
    Last edited: 5 May 2015
  12. 459b

    459b Moderator MASA Contributor

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    What are you dosing?
     
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