Over Skimming

Discussion in 'General Discussions and Advice' started by Oopkrane, 25 Nov 2013.

  1. Oopkrane

    Oopkrane

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    I have a 130l total volume system and until recently been running a cheap and nasty skimmer. Been dosing NO3PO4 all along. Switched over to a Reeftek TS1 (running 24/7) and now my macro algea in sump is starting to die off and getting cyano algea on substratein DT.
    Could this be due to over skimming?
     
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  3. Visser

    Visser MASA Contributor

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    Yip, very possible.
    Do you take readings for nitrates & phosphates in your tank? If not, you might want to consider it.

    When using no3po4x with a underrated skimmer... Not all the nitrates & phosphates gets removed. The algae gets acclimated to the higher nutrients in the tank, & grows on that.

    Now, once you upgrade your skimmer, the nutrients (no3, po4 & other dissolved organics) gets removed a lot more effectively (with the help of no3po4x).Now, you suddenly get a fall in drop in available nutrients, & the algae starts to starve...
    A quick summary of what's happening...
     
  4. Oopkrane

    Oopkrane Thread Starter

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    Thanks, but why is the cyano suddenly growing?
     
  5. Visser

    Visser MASA Contributor

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    Could be due to an imbalance in redfield ratio (more phospates than nitrates within ratio)
    Have you measured no3 / po4 ?
    Could also be due to the sudden increase in decomposing material caused by the dying algae...
    Remember, algae absorbs nutrients. When the die, there will be a sudden increase in nutrients again, & cyano just loves decomposing material!!!
     
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