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L2 Rev 3 on 120 Gallon Reef Tank

Discussion in 'General Discussion' started by freshoffthegrill, Jan 19, 2017.

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  1. freshoffthegrill

    freshoffthegrill New Member

    5
    1
    NJ
    Finally got my 120 Gallon Reef tank up and running. Recently completed cycling the tank and added my first fish. I plan on running the L2 with a protein skimmer, filter socks and periodic use of carbon.

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    Algae Scrubber-Day 9.jpg


    Last two days the screen has really taken off from next to nothing. I have the LEDs on 100% and the photo period of 18 hours, this might be too long and I will back off if I see any ill effects. So far so good....
     
  2. Turbo

    Turbo Does not really look like Johnny Carson Staff Member Site Owner Multiple Units! Customer

    So you have the Rev 3.5 (which is the Rev 3 with the dimmable lights) - with the dimming option I recommend running the lights at 6 o'clock for 9 hrs/day until you get a base of growth, but hey, whatever works right? As long as you aren't getting photosaturation (zero growth or patches of no growth) then you could do worse!
     
  3. freshoffthegrill

    freshoffthegrill New Member

    5
    1
    NJ
    Exactly, if I see any bare spots developing I will back it off.

    The tank is experiencing the first diatom bloom, I am happy to see the scrubber growing well so far.
     
  4. Turbo

    Turbo Does not really look like Johnny Carson Staff Member Site Owner Multiple Units! Customer

    It is generally better to light the screen as long as you can at a lower level versus as high as you can for a shorter time. If you dial back to 2 or 3 o'clock, you can probably light 22 hours or more without risking photosaturation.

    Plus it might actually start faster under slightly dimmed lighting. One of the reasons is that the LEDs are PWM dimmed, meaning, they flash at a very high frequency vs current reduction dimming. Flashing isn't "proven" to make a difference in algae scrubbers specifically (one of those non-studied things) but it has been studied in both corals and plants/algae, it has to do with efficiency and the "dark cycle"....don't have time to get into it at the moment
     
  5. freshoffthegrill

    freshoffthegrill New Member

    5
    1
    NJ

    Thanks for the recommendation. I adjusted the dimmer to about the 3 o'clock position and upped the light to 21 hours.
     
    Turbo likes this.
  6. freshoffthegrill

    freshoffthegrill New Member

    5
    1
    NJ
    I had to dial back the lighting period and intensity once the cycle ended. I have the lights on form 14 hours and the dial at the lowest setting after the screen started to turn yellow and then white in most areas. Over the past three days the white and yellow has started to change to green.
     
  7. freshoffthegrill

    freshoffthegrill New Member

    5
    1
    NJ

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