What is this weird sack type thing?

Discussion in 'Algae' started by Kully3xf, Jan 31, 2013.

  1. Kully3xf

    Kully3xf Reefer Madness

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    [​IMG]

    there's like 5 of them on the underside of one rock... hasn't spread to new rocks yet; i assume i should take it out?
    Any ideas?
     
    Kully3xf, Jan 31, 2013
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  2. Kully3xf

    Salty B

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    Pineapple sponge. Harmless. They come and go.
     
    Salty B, Jan 31, 2013
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  3. Kully3xf

    Kully3xf Reefer Madness

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    Good news! Thanks! They look menacing!
     
    Kully3xf, Jan 31, 2013
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  4. Kully3xf

    Salty B

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    They like the dark/shaded areas so they dont become an eyesore. They're filter feeders so as little as they might help, we'll take all the help we can get.
     
    Salty B, Jan 31, 2013
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  5. Kully3xf

    Kully3xf Reefer Madness

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    yeah, i just read that they are self limiting... they only feed on one thing; and it comes from non-ro water really... so my r/o membrane is getting weak, and i just ordered a new one; should be gone soon!
     
    Kully3xf, Feb 1, 2013
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  6. Kully3xf

    little_fish Moderator

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    Not true, they are in tanks run only RO/DI water as well
     
    little_fish, Feb 1, 2013
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  7. Kully3xf

    Waddi Shenanigans? VIP Member

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    I have tons on the side of my tank that had no lighting for months, the other side is completely clear. I use RODI.
     
    Waddi, Feb 1, 2013
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  8. Kully3xf

    chichimom79 reef junkie

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    I have them too and have always used RODI :D
     
    chichimom79, Feb 1, 2013
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  9. Kully3xf

    Bifferwine I am a girl

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    I had a lot of them in my overflows, and I only used RODI water. They can be found in any tank that has a food source for them.
     
    Bifferwine, Feb 6, 2013
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