High light and CO2 - photosynthesis on sand??

Discussion in 'General Planted Tank Discussions' started by PM, 11 Sep 2009.

  1. PM

    PM Member

    Messages:
    611
    Location:
    London
    Hi guys,

    Quick question, with high light and CO2 is it normal to have bubbles forming from photosynthesis on light sand?

    This is happening at the front of my tank, the sand is very light in colour also, and the tank is only 30cm deep.

    Is this a problem? Start of BGA or something else??
     
  2. aaronnorth

    aaronnorth Member

    Messages:
    3,955
    Location:
    worksop, nottinghamshire
    it might just be oxygen coming out of aquaeous form as the water is saturated.
    it could also be Nitrogen gas, or Hydrogen sulphide.

    is it a constant thing or does it occur at regular times?
     
  3. PM

    PM Member

    Messages:
    611
    Location:
    London
    It happens after the lights have come on. It's not excessive, but I recently increased the light, and noticed it (I don't think it happened before, or at least I never saw it)!
     
  4. Ed Seeley

    Ed Seeley Member

    Messages:
    3,262
    Location:
    Nottingham
    It sounds like there is some algae in the sand that is photosynthesizing and releasing gas. It's nothing to worry about IME unless the algae gets too thick and stirring and syphoning off the sand during water changes usually keep it in check.
     
  5. PM

    PM Member

    Messages:
    611
    Location:
    London
    Cool, thanks.
     

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