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Thread: Rock Density

  1. #1
    Senior Member ALRHA's Avatar
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    Rock Density

    In general, are rocks better more dense (get more lbs of rock per volume) or less dense (more water and less rock in the space = more bio-filtration?)?
    Albert
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  2. #2
    Senior Member Flame*Angel's Avatar
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    I find Fiji can be more dense, rock from Indonesia, Tonga, Marshal Islands is more porous.
    Susan

  3. #3
    Senior Member ALRHA's Avatar
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    and is it better to have more porous rock? are 80lbs of porous rock more efficient than 100lbs of dense rock, for example?
    Albert
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  4. #4
    Senior Member Flame*Angel's Avatar
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    Definitely go for the more porous rock. Besides the better biofiltration it looks better, is easier to stack, provides numerous habitats for tiny beneficial critters (pods etc) and has tons of great crevices for mounting coral frags. You buy less to fill in the same amount in your tank too.
    Susan

  5. #5
    Senior Member ALRHA's Avatar
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    thats what i wanted to confirm.
    thanks.
    Albert
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  6. #6
    Moderator Krugar's Avatar
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    Any tips on avoiding / preventing surprises when you get porous rock?

    The last batch I added to my nano from a lfs (susposedly cured) had at least 4 rather nasty crabs hitch hiking on it & they've been a fun time to get out of the tank.

    I like the idea of porous lr, but I'd like to avoid that type of surprise.

    Cheers!
    There is nothing so permanent as a temporary measure.

  7. #7
    Senior Member ALRHA's Avatar
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    i think i once heard of quarantining the rock suspended on egg crate. dont feed the quarantine for a few days (crabs will get hungry) then put some food on the bottom of the tank. when the crabs get out of the rock to get the food on the bottom, they wont be able to climb the glass to get back in.
    Albert
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  8. #8
    Senior Member ALRHA's Avatar
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    (i've never done this, but it sounds like it should work)
    Albert
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