Algae under rocks, explain that...

Discussion in 'Nuisance Algae' started by RiaanP, 29 Jul 2010.

  1. RiaanP

    RiaanP Moderator

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    I got a bit of a problem. I got green algae growing at the lower parts of my tank. Even under the rocks. [​IMG]

    Phosphates are zero, all other parameters are zero. Everything else in tank is 100%. Except the Pincushion being killed by the phospate remover...
     
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  3. vatso

    vatso

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    Well the rocks could be leaking phospates
     
  4. maj

    maj

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    how long does it take for say a 2kg rock to fully exhaust all the PO4 from it?
     
  5. butcherman

    butcherman Moderator MASA Contributor

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    depends how concentrated the PO4 is in the rock
     
  6. mariusmeyer

    mariusmeyer

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    Can you determine what type of algae?
     
  7. vatso

    vatso

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    Depends how fast it leaks so could be months - just control if with algea eating inmates - like a sea hare slug I have one & it works like a bomb even eats byopsis
     
  8. maj

    maj

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    so how do you determine that the rock is actually leacing PO4 and how concentrated it is?do u need to isolate the LR and test it in separate water?

    then maybe just use that run anti phos on that isolated LR,shouldn that exhaust the PO4 quicker?

    its hair algae u have growing ther riaan?
     
  9. vatso

    vatso

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    how do you test the rock you can't you test your water & if it says PO4 = 0 then there is none in the water & then you will only find that algae on a rock or some rocks but not all over the place one would then know the rock is the problem
     
  10. maj

    maj

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    cool
     
  11. RiaanP

    RiaanP Thread Starter Moderator

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    On the other side of the tank, I got some algae on the baserock.

    Yes got a Seahare a few days ago, so far he is not interested in the algae.
    And tangs (Sailfin, Blond Naso and Chocholate) is not interested either.

    will see this weekend.
     
  12. RiaanP

    RiaanP Thread Starter Moderator

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    And to have the rock leaching PO4, I had to overload the system with PO4 at some point for an extended period. For the rock to be able to get saturated with PO4. so that now if PO4 in water is low, to start the process to leach PO4 from the rock back to the water.

    But my tank, and previous tank the rock came out of, the PO4 was very low since last year April. So that I do not understand.

    any other possibilities?
     
  13. Dane

    Dane

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    is the top of the rock covered completely by corals and corraline? Maybe its the only place the algae can get a foot hold? Outcompeted by the coralline etc.
     
  14. vatso

    vatso

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    If there is die off in your rock that will also cause PO4 does not always mean you had excess in your tank?

    if the water parameters are okay & you do not believe it's leaching rocks you need to find the source of the problem - try take the algae rocks out & see if you get more algae that will tell you for sure if the rock is the problem or not
     
  15. RiaanP

    RiaanP Thread Starter Moderator

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    Nope, plenty of open spaces. Yes some open space, lower down is being taken over by algae. Removing the rocks, not an option, got live on it.
     
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