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Thread: Friend or Foe??

  1. #1
    Senior Member
    Join Date
    Nov 2007

    Friend or Foe??

    Can anyone help identify this growth on my live rock? (image attached).
    Attached Thumbnails Attached Thumbnails Friend or Foe??-unknown-plant.jpg  

  2. #2
    Senior Member DARK's Avatar
    Join Date
    Aug 2004

    Grape Caulerpa is generally considered good when it stays where it is suppose too, but it can easily become a weed that can be difficult to eradicate in the reef tank. If you introduce Caulerpa into your main tank, either on purpose or accident, keep a close eye on it and prune heavily to keep it in check.

    Grape C. can go sexual and disintegrate overnight adding substantial biological load to the tank. This can be minimized by heavy pruning which seems to retard this tendency. There is also some evidence that keeping the lighting on 24/7 will prevent this from happening. This is obviously only an option when the algae is housed in a refugia or sump. Herbivorous fish like tangs will sometimes help to keep the Caulerpa in check.

  3. #3
    Former Moderator a4twenty's Avatar
    Join Date
    Nov 2006
    i agree, take it out without damaging it if you can. this species will actually release toxins ( defense mechanism ) when damaged and is not suitable for reef tanks. i have seen it go sexual, when i first started i had some in my sump. luckily i caught it in time but there was a layer of death starting in my fuge that would have wiped out my tank.

    also growing macro algae to feed your fish is counter productive. most of us grow macro algae to remove nutrients but if you feed it back to the fish all the nutrients are going right back in the tank.

    120S RR tank with 60G basement sump / fuge

    Return Pump: Little Giant 4-MDQX SC
    Water Movement: MP40W, Seio 1500, (2) Hydor K4's
    Lighting: 400W SE MH with 10K Venture
    Skimmer: Euro-Reef RS250 with gate valve
    Other: RODI, RDSB, PO4/AC reactor

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  4. #4
    Senior Member
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    Nov 2007
    So, should I remove it from the rock, or leave it and keep it nice and short?

  5. #5
    Senior Member DARK's Avatar
    Join Date
    Aug 2004
    Remove it completely if possible.

  6. #6
    gvv is offline
    Senior Member gvv's Avatar
    Join Date
    Sep 2004
    If you have tangs, it will be just a nice snack for them

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