Black substance on rocks

Discussion in 'Hitchhiker & Critter ID' started by ltrace, Nov 6, 2017.

  1. ltrace

    ltrace Well-Known Member

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    My tank three years old in Jan 2018. I have notice this black carpet like substance on a couple of live rocks. It is also on snail that was crawling across the top of the rock. Can anyone ID this substance and if it is harmful to the tank how to rid it from the tank?
     
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  2. sfin52

    sfin52 Well-Known Member

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    Can you get a pic. I think that would help a ton.
     
  3. ltrace

    ltrace Well-Known Member

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    IMG_20171106_094400.jpg IMG_20171106_094534.jpg IMG_20171106_094546.jpg IMG_20171106_101642.jpg
     
  4. sfin52

    sfin52 Well-Known Member

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    That snail is a master of camouflage. If I were you I would blame the snail:p:D I don't have a clue. I'm sure somebody on this site will known.
     
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  5. ltrace

    ltrace Well-Known Member

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  6. DSC reef

    DSC reef Well-Known Member R2R Supporter R2R Excellence Award

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    Looks like red turf algae. Astrea snails have went to town on that stuff in the reef tank. The snail can't clean it's own shell though;)
     
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  7. sfin52

    sfin52 Well-Known Member

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    I have seen my snails cleaning each other. Or you could take a toothbrush and clean it off.
     
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  8. ltrace

    ltrace Well-Known Member

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    The substance is very black and doesn't blow off or scrape off.
     
  9. DSC reef

    DSC reef Well-Known Member R2R Supporter R2R Excellence Award

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    Looks dark red to me. I'm saying turf algae, extremely hard to manually brush off.
     
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  10. ltrace

    ltrace Well-Known Member

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    If that's the case how do I rid it from the tank?
     
  11. DSC reef

    DSC reef Well-Known Member R2R Supporter R2R Excellence Award

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    I had about 15-18 astrea snails in the 75, they literally devoured it over time. I tried to brush it off with no success. Maybe a wire brush would fare better though
     
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  12. Humblefish

    Humblefish Dr. Fish Staff Member Team R2R R2R Supporter R2R Excellence Award Expert Contributor Article Contributor Louisiana Reef Club Partner Member 2018

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    Looks like some sort of turf algae, but let's ask #reefsquad for their input.
     
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  13. reeferfoxx

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

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    I had this growth once a few years ago. Lighting was a factor in my case. Lighting intensity as well as exposure time.
     
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  14. jsker

    jsker Reefing is all about the adventure R2R Supporter R2R Excellence Award Reef Squad Leader Build Thread Contributor Article Contributor Partner Member 2018

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    Any idea of what the phosphates and nitrate are?

    What are you parameters
    Ca
    Alk
    Mg
     
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  15. jsker

    jsker Reefing is all about the adventure R2R Supporter R2R Excellence Award Reef Squad Leader Build Thread Contributor Article Contributor Partner Member 2018

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    Good point:)
     
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  16. reeferfoxx

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

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    Yep. Dug up this old photo of my growth. All I did was focus more attention on light intensity and exposure time. Both were reduced and ended up eliminating this growth. So, it wasn't so much a nutrient issue.

    post-88129-0-00230600-1443830351.jpg
     
    Last edited: Nov 6, 2017
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  17. ltrace

    ltrace Well-Known Member

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    Ca-420
    Alk-8.4
    Mg-1560
    ph-8.2
    Nitrate-5
    Nitrite-0
    Ammonia-0
     
  18. divewsharks

    divewsharks Well-Known Member

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    I had great success with tuxedo urchins in the past.
     
  19. Segalplayer

    Segalplayer Well-Known Member

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    [​IMG]

    Any ideas on what this red thing is? I’ve seen a couple specs on rocks and now shell that is near the front glass...

    Sal- 1.025
    PO4 20pbb (0.061)working on bringing down
    Calcium 375
    Alk 8.4
    Temp always 78-79
     
  20. Rip Van Winkle

    Rip Van Winkle Well-Known Member

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    Agreed. Tuxedo urchin or maybe small short spine. They will mow everything down very quickly. Not sure what else you have in your tank? If possible move the rock to the sump and have them clean it there?
    The problem is after they are done, what to do with them. Maybe you could get a loaner from the LFS or have someone take it off your hands after it's done. I've given up on having urchins in my tank, they can chew through almost anything.

    I have to say though, I think if you have this in your tank it's a pretty good sign. Rocks in the tide pools where I am are covered with this so it's natural for it to grow and even healthy. I have this on the rocks that I've wild collected and there is a lot of life on them. The algae is also beneficial.
     
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