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Fish Gasping

Discussion in 'CO2 Enrichment' started by scottward, Jun 14, 2010.

  1. scottward

    scottward Guru Class Expert

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    Hi,

    Just repeating what I wrote in an earlier thread; I have a 100g tank, AM1000 + powerhead misting CO2 through a spray bar into the thickest parts of my planted tank.

    CO2 comes on at 1pm and goes off at 11pm.
    Lights come on at 2pm and go off at 12am.

    I have been slowly tweaking my CO2.

    At about 9pm, my fish start heading for the surface.

    I understand that plants do most of their growing (i.e. CO2 utilisation) during the first 8-9 hours of the photoperiod. So, this seems to coincide with when my fish start gasping. Am I right to assume that my CO2 levels are probably pretty good between 1pm and 9pm, and then simply start to climb into the danger zone once plant utilisation slows down at 9pm?

    I can either dial the CO2 down slightly, or, increase surface turbulence. I'm leaning towards the former as I don't want to waste CO2.

    My tank is very understocked, by the way, so it can't be an oxygen shortage.

    Scott.
     
  2. shoggoth43

    shoggoth43 Lifetime Charter Member
    Lifetime Member

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    Why not simply use a second time on the CO2 so you can have it shut off ~9 or so? Chances are the tank will be outgassed of CO2 within 30 minutes or less unless you have gone to some lengths to minimize all surface turbulence.

    -
    S
     
  3. scottward

    scottward Guru Class Expert

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    Hi Shoggoth43,

    I do use a second timer for the CO2 (1 timer for the lights, seperate timer for the CO2).

    I could change the timer for the CO2 to turn it off at 9pm quite easily. I just wanted to check my assumptions first, before I go ahead and do this.

    Scott.
     
  4. MarkMc

    MarkMc Junior Poster

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    This is what I do. One hour before lights on-CO2 on-one hour before lights off-CO2 off. Couple of hours later an air stone comes on and runs for a few hours. 8 hour photoperiod.
     
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