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ultra low kH tank

Discussion in 'The Reef Chemistry' started by chriscoral, Feb 12, 2016.

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  1. chriscoral

    chriscoral
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    Royal Gramma

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    The boss of a new LFS claims his 6wk-old display tank runs on a kH of 4.5 and Ca of 390. The tank has no dosing, no Ca reactor, only simple sump with PO reactor. He says 28 years of keeping SPS has given him a sense of what the corals need. Is this possible? The corals look ok, but 6wks is too short to judge.
     
  2. youdontknowme

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    Seasonal aquarium.
    No calcium reactor but got dosing pump for kh/cal to maintain parameters.

    Yes, corals can survive at that parameters.

    He sees what the corals lack of. Then dose what it needs. This should be the way instead of dosing blindly.

    [​IMG]

    To be the best, Learn from the best
     
  3. James72

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    Clarion Angelfish

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    Even 6 months is consider short. But no problem for lfs, every shipment can change.

    Sent from my GT-I9300 using Tapatalk
     
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  4. aquareef123

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    Blotched Anthias

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    Kh of 4.5 and ca of 390 is lower than nautral seawater. I wont recommend it. Furthermore coral need these to build their skeleton structure. So meaning sps in this tank will grow very slowwwwwly. Unless u dont mind your sps doesnt grow.

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  5. Quas111

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    Platinum Clownfish

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    When your kh is low, your ph will also drop. This drop in ph will cause corals to stop producing skeleton as corals build skeleton through ph differences. Thus i doubt long term the corals will grow quick as there is only so low their ph can go
     
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  6. Sherman

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    Gem Tang

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    KH lower then 6 will result in very unstable PH.
    Also low KH ... fish look sick and stress. Coral no or little polyp extension.
    Sun and tube worm refuse to come out....
    For LFS I think is ok. Their stock will not sit in the tank more then 2 months
     
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  7. Reef

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    Platinum Clownfish

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    That picture is a pic of his main DT upfront, not sure if the colonies inside are up for sale... His colors & PE look amazing so, supposing his KH is really 4.5 then that puts a really interesting spin on things when it comes to the ideal parameters for maintaining SPS tanks
     
  8. Fragmaster

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    Platinum Clownfish

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    The owner of the should write a scientific paper on it with data . This could be important finding that can save reefers lots of money on adding kh and ca supplements.


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  9. youdontknowme

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    Alot reefers have already proven it. That keeping low kh, no problem at all. At 4kh also no problem.
    Quick fluctuations is the problem.
    But in theory, the lower the kh = slower the growth while higher kh = faster growth.

    And also in experience,
    lower kh = nicer color while higher kh = brownies.



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  10. James72

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    Clarion Angelfish

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    You can keep low kH if you have a means of maintaining stable pH. I personally tested 1.5 months of running RVS at 4dkh. No issues

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  11. Sherman

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    Gem Tang

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    James you are right. The main issue of low kh is your PH can become very unstable.
    When your PH is very unstable any kind of issue kind coming out
     
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  12. chriscoral

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    Royal Gramma

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    Interesting observation abt low kH = better colors! Any proof?
     
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  13. Arreef

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    Flame Hawk

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    I have always wondered why we consider our kh to be on the low end when we have it at about 7. Thats roughly the level of the actual reef so shouldn't 7 be the norm here and not 9 and above

    reefing from pasir ris
     
  14. youdontknowme

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    Proof is in google hahaha.

    How many nice coloration tank is high kh vs low kh??

    Sps nsture origin kh is around 7 ish like arreef pointed out. So keeping it as close as the nature is best, dont see why theres a need to change it to keep kh so high.

    Most people achieve nice coloration via low nutrient system. And when in ulns, to prevrnt sps burn tip, got to keep kh below 8.

    Many ulns users reported having many burn tips when keep high kh in ulns system. Got to do with their tissue being thin in ulns, and high kh forces them to grow faster hence thinner tissue and more prone to growth tips.

    Also take a look in the red sea link.
    Accelerated growth they recomended kh 12. For colors, kh is much lower.
    Enhanced Coloration or Accelerated Growth? - Red Sea











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  15. James72

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    Clarion Angelfish

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    As long kH between 7dkh to 8dkh I won't make any adjustments.

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  16. Sherman

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    Gem Tang

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    Yes. 7 to 8 dkh is good. Easier to maintain as most salt is around.(Except for a few)
     
  17. chriscoral

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    Royal Gramma

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    Interesting. Tks all for the sharing.
     
  18. Wongyeng888

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    Princess Anthias

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    Err...how come low kh affect ph leh ? Ph is level of acidity vs alkalinity tio boh ?

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