Lava rock any good?

Discussion in 'Beginner Discussions' started by Sheldon77, 4 Apr 2016.

  1. Sheldon77

    Sheldon77

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    Hi guys is lava rock any good for a marine tank? Or would you recommend a different type?

    Also with my tank I will be starting the cycle process soon, is there any negative effect of having live rock during this cycle?
     
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  3. RiaanP

    RiaanP Moderator

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    The cycle is not about the water, it is all about the rocks. More specific, the dead things in and on the rocks. And how they are disposed of, eaten or rot away. And the good bacteria population growing within the rock, digesting the dead critters.

    Yes, there are some free floating bacteria in the water. But is nothing compared to the numbers inside porous rocks.

    Lava rock can work. But note that new ones can leach more phosphates into the system than wanted. Also they are not as porous as good quality liverock.
     
  4. Dexter

    Dexter

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    Yip you need live rock. Not sure what you mean by lava rock. lava rock I know, I used to use in my tropical tanks but that wont work in marine i think. (They have very sharp edges etc and I think they not porous enough for bacteria)
     
    Last edited: 4 Apr 2016
  5. Sheldon77

    Sheldon77 Thread Starter

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    Thanks guys, guy at a fish store was saying it's better than most rock for marine tank.

    Will be getting live rock then.
     
  6. zippy

    zippy

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    I've seen success with either, lava rock can be used as base Live rock. Hell I've even seen success with clay bricks...
     
  7. RiaanP

    RiaanP Moderator

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    I got 3 rather big pieces of lava rock in my holding tank. Big and round. Not the easiest to build with either.

    They do hold a lot of water.

    But size on size, they are heavier than liverock. Depending on where you buy, I'm sure you will be better off buying real liverock for the same volume.
     
  8. Sheldon77

    Sheldon77 Thread Starter

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    Thanks guys, might use some to add some contrasting colours
     
  9. Grumbles

    Grumbles

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    It will all be covered by algae and or corals later on anyway, so don't let initial colours dictate your rock choice.

    You want as much surface area as possible for bacterial colonisation, so rather use that space for proper live rock.
     
  10. hotdog83

    hotdog83 Clone Fish

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    I would not trust lava rock in a reef, a lot of them has metal streaks etc inside that I have seen, so I would be too scared that it would leak heavy metals and other nasties into the water.
     
  11. Sheldon77

    Sheldon77 Thread Starter

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    great thanks guys good to know. buying some live rock from the for sale zone.
     
  12. RiaanP

    RiaanP Moderator

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    great idea :thumbup:
     
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