Curing cry rock in RO/RODI vs SW

Discussion in 'Reef Aquarium Discussion' started by Mike N, Oct 10, 2017.

  1. Mike N

    Mike N Well-Known Member R2R Supporter

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    I have a lot of dry rock to cure. I would prefer to cure in RODI water to save some cash on salt.
    Any advantages to curing in saltwater vs RODI?
     

  2. redfishbluefish

    redfishbluefish Stay Positive, Stay Productive R2R Supporter R2R Excellence Award Reef Squad Build Thread Contributor NJRC Member Article Contributor

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    Interesting!


    The only negative I can think of is that freshwater bacteria will fill the rock and now once placed in saltwater, it will die, and now require a second cure.
     
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  3. Mike N

    Mike N Well-Known Member R2R Supporter

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    Ok, so use salt water for curing, got it.
    Lol thanks
     
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  4. reeferfoxx

    reeferfoxx Well-Known Member R2R Supporter R2R Excellence Award Reef Squad Build Thread Contributor

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    You can cure rocks in freshwater. The bacteria will die but the "re"cycling period will be shortened compared to curing dry rock in a DT. Might as well just cycle in saltwater. ;)
     
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  5. CindyKz

    CindyKz Well-Known Member

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    I never understood this. If the rock is dry aren't the bacteria dead anyway?
     
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  6. Mike N

    Mike N Well-Known Member R2R Supporter

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    Dead yes, but the remnants are still there. As well as those from (once)living organisms on the surface and deep inside the rock.
     
  7. CindyKz

    CindyKz Well-Known Member

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    Yes, but they aren't going to come back to life so what difference does it make what type water it is? I soak dry rock to leech out phosphate and other nasties left over from the once living organisms you're referring to. Then when I am ready to use it I either add it to my existing system (where existing bacteria will populate it) or I add a source of living nitrifying bacteria to start a new one.

    Point being, salt vs. RODI - you can't kill what's already dead.

    I am wondering if I am missing a major point.
     
  8. Mike N

    Mike N Well-Known Member R2R Supporter

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    If I understood @redfishbluefish well enough, the point is that freshwater bacteria will colonize the rock. Which will die off once placed in saltwater, defeating the purpose of curing.

    Whereas when curing in salt water, the bacteria stays alive but any dead remnants are washed away. Therefore nothing left to die off once curing is compete.
     
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  9. CindyKz

    CindyKz Well-Known Member

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    I guess what I'm wondering is where the live freshwater bacteria that will supposedly colonize the "dry" rock come from? There would be none in rodi or mixed salt water and everything on the dry rock is dead.

    I understand soaking rock to get some of the "bad" stuff out but I don't see how it can have any effect on bacterial population unless bacteria are added in some way....live rock or bacteria in a bottle.
     
    Last edited: Oct 10, 2017
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  10. Mike N

    Mike N Well-Known Member R2R Supporter

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    Gotcha, that question is above my pay grade. I'm curious to know the answer as well.
    @Randy Holmes-Farley care to comment?
     
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  11. reeferfoxx

    reeferfoxx Well-Known Member R2R Supporter R2R Excellence Award Reef Squad Build Thread Contributor

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    Everything around us contains the building blocks to life. I can't exactly remember what its called but the spores for bacteria to colonize are on our bodies.
     
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  12. saltyfilmfolks

    saltyfilmfolks Lights! Camera! Reef! R2R Supporter R2R Excellence Award Reef Squad Photo of the Month Award

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    Use old tank water. It has bacteria in it.
     
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  13. Montu

    Montu Well-Known Member R2R Supporter

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    Isn't curing an entirely different process than establishing a beneficial bacteria colony and completing a tank cycle?

    I thought curing dry rock was just letting all the dead stuff fall off and finish decomposing, in this case it doesn't matter what you use...I used water from the hose and a bunch of bleach for 7 days then rinsed everything and finished the cure with a quick Muriatic acid bath, then proceeded to place it in the tank to cycle.
     
  14. Mike N

    Mike N Well-Known Member R2R Supporter

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    Yes it is. This thread is about curing, not establishing biofilter.
     
  15. reeferfoxx

    reeferfoxx Well-Known Member R2R Supporter R2R Excellence Award Reef Squad Build Thread Contributor

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    You are describing cooking the rock. Cure and cycle are essentially the same. Curing would entail more on the aspects of allowing nutrients to build up and then be removed either water changes or algae growth.
     
  16. saltyfilmfolks

    saltyfilmfolks Lights! Camera! Reef! R2R Supporter R2R Excellence Award Reef Squad Photo of the Month Award

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    I would still cure it in saltwater to let the bacteria do the heavy lifting for me.


    My coral qt is fallow and I never feed it. It's my first thank now that I've ever seen true zeros. All the "food"has been eaten. To prep to put coral in I have to do weekly water changes in advance and during to make sure it gets fed or the corals die.
     
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  17. reeferfoxx

    reeferfoxx Well-Known Member R2R Supporter R2R Excellence Award Reef Squad Build Thread Contributor

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    +1. Even if intention are to get decomposed matter off before the DT, no matter freshwater or saltwater a cycle will happen. They are one in the same. But with saltwater you can retain the bacteria colony. Cooking the rock is when you do a muriatic, bleach, or lanthinum chloride bath. That would happen prior to curing or cycling.
     
  18. redfishbluefish

    redfishbluefish Stay Positive, Stay Productive R2R Supporter R2R Excellence Award Reef Squad Build Thread Contributor NJRC Member Article Contributor

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    First off bacteria is the most ubiquitous creature on earth. It is found here, there and everywhere. No introduction is needed, because it's already there. So starting with RO water, bacteria will find its way into the water.

    Now let's talk curing. Curing is when the death within the rock leaches out. This is assisted by bacteria breaking down (decomposing) the dead stuff in your rock. So it's best to have saltwater bacteria there since freshwater bacteria would be killed when placed in saltwater, requiring another cure.

    To cure, the only thing needed is a little flow. No lights or heater are needed....assuming this is done in a heated room, not in your garage in the middle of winter in Minnesota. Let it stew, and measure nitrates (and phosphates), and do water changes if and when these numbers get high. Note that curing may take a month or two depending on how "dirty" the rock was. You know it's done when N's and P's are no longer rising after a water change.
     
  19. jda

    jda Well-Known Member

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    There is bacteria in everything that can start to colonize, but this is not whey people suggest curing your dry rock. It is so that some bound terrestrial phosphate, and perhaps dead organic matter, can start to unbind into the water in the container.
     
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