strange cyano

Discussion in 'Nuisance Algae' started by RiaanP, 30 Jan 2014.

  1. RiaanP

    RiaanP Moderator

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    Not even sure this is cyano. The color is right but nothing else is typical of cyano

    There is no air bubbles being trapped in it. Not stringy. Making a mat on the sand only. Yes, it is the slowest flow area in my tank. It is only on the substrate right in the middle front of the tank. Not on any rocks. Substrate is real sea sand.

    In the mornings, it is at the worst. Complete red carpet.
    This is about 2 hours after lights on

    [​IMG]

    In the afternoon, its all gone. About 2 hours before lights out.
    [​IMG]

    As I understood cyano, it grows more during the day under the lights, not disappear. By the time my lights goes out, its all gone. Clean sand.

    Its easy to siphon out, but it just comes back. Does not really bother me either, just want to know what it is. And if it is cyano, why does it behave differently from what I thought I know of cyano.
     
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  3. Nemos Janitor

    Nemos Janitor

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    It is cyano Riaan. The reason it is in the low flow area and only develops at night is due to CO2 generation.
     
  4. RiaanP

    RiaanP Thread Starter Moderator

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    hmmm...
    chain reaction of events then.

    I removed my kalk stirrer reactor, as I'm away too often. Rather run without it than refilling only every second week.
    But I did notice that my PH is now dropping to about 7.8 in the morning, and rise back up to 8.1 during the day. A PH swing is not bad, as long as it is the same swing every day. If it stays constant and then suddenly swings like that, then yes its an issue.

    Maybe need to put the reactor back into action
     
  5. irie ivan

    irie ivan MASA Contributor

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    Ine of the functions of kalk.... Combat co2
     
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