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Featured Algae on coral - cause or effect?

Discussion in 'Reefs' started by Ade_S, May 9, 2017.

  1. Ade_S

    Ade_S Registered

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    Hi guys. Just noticed one of my SPS has been overrun by algae. looks like the coral is dying. There's not a great deal of algae in the tank and I'm not sure if its on the coral simply because it's already dying, or whether the algae is smothering it and causing it to suffer.


    It's in a pretty bright bit of the tank so I've just reduced the intensity of one of my Vegas as another SPS nearby looked to be bleaching.

    Any thoughts?

    Cheers,
    Ade[​IMG]

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  2. warby

    warby Registered

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    what are your params like? and are they stable?
    how far under the lights are they and how far off the surface are they? what percentage are the lights running at?

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  3. merser

    merser Registered

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    Ime algae will only grow on dead tissue. When it's alive the coral is more than potent enough to keep it at bay. I get it occasionally when my faster growing sps grow into an area of direct flow.

    I'd be looking for reasons the coral flesh could be dying.

    Jamie


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  4. Ade_S

    Ade_S Registered

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    Parameters seem pretty good, I think:
    Kh 9.6 (fallen from 9.8 a fortnight ago)
    Ca 455
    Mg 1380
    PO4 0.03
    NO3 <1
    NO2 0
    NH3 0
    Ph 8.3
    Salinity 35ppt
    Temp 25.9C

    All are stable.

    Lighting is 3x Vegas over a 4ft tank. They're mounted in three hood, so about 3" off the surface with cover glass between. They were running at 80% but I've just reduced the middle one to 60% (2 days ago, afterI noticed the algae on the coral).

    Position is about 9" below the light (on top of a rock, no shading).

    Cheers,
    Ade

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  5. Ade_S

    Ade_S Registered

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    Jamie could be onto something. There's a powerhead pointing pretty close to the coral.


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  6. merser

    merser Registered

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    Could try moving that piece and see if it improves?

    I go for a really high flow tank so struggle to positioning sps. Hard to have high flow but not have coral bang in front of a pump.


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  7. Ade_S

    Ade_S Registered

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    It's probably easiest to angle the powerhead away slightly. I'll try that.

    Anything I can do for the coral? There's some flesh still on the back. Is it worth me trying to brush the algae off with an old toothbrush? Suspect it would just come back...

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  8. merser

    merser Registered

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    Not sure on that one mate. If the flesh starts to recover then it will grow back over I reckon and will batter the algae.


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  9. Ade_S

    Ade_S Registered

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    Cheers - fingers crossed!

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  10. warby

    warby Registered

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    I wouldn't go for flow to be honest. I'd say lighting could be burning the corals tips. 80% 3inches above the surface seem very high to me.
    also higher levels of alk and low nutrients can cause alk burn on corals.
    it could be a combination of a few things rather then just 1.

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  11. merser

    merser Registered

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    It's on the side though Si. Not the tips or bottom up? Well could be tip maybe that's stripped downward. It's the one side that makes me think flow.

    Just my best guess


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  12. McPikie

    McPikie Registered

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    Jesus. 3" at 80%? I'd move those up or knock it down on power
     
  13. warby

    warby Registered

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    flow wouldn't cause it to strip but it could cause it to go further I.e. if the tip stripped then high flow started to peel off the flesh but it would need to be very high and concentrated sps can take a lot of flow. if seen the directly in front of a mp40 before now. and if got a few under where my 2 gyres meet and they love it but that's turbulent not direct as such.

    he also said there's another coral.near by that's bleaching which makes me think more light related aswell. but it could well be a combination of a few things.

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    Last edited: May 10, 2017
  14. merser

    merser Registered

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    My claliendrum gets the flesh blown off all the time mate!


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  15. warby

    warby Registered

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    wouldn't have expected that but I guess anything is possible :) or it could just be your sps keeping skills as we all know what there like

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  16. merser

    merser Registered

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    THATS OUTRAGEOUS!!!!!


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  17. McPikie

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    When you say stable, have you measured every day for a week to see if there is any drop before water change day?
     
  18. Ade_S

    Ade_S Registered

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    I test about every fortnight (I know! ) but on random days, so not always just before / after a water change. All seem consistent though Ph swings about from about 8.0 to 8.3 each day, according to my Seneye.

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  19. warby

    warby Registered

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    if you have the seneye you could test the par under the lighting and see how high it is?
    most tanks have ph swings some bigger then others I don't even bother with oh anymore it is what it is in my tank lol.

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