Refugium light on for how long?

Discussion in 'New To The Hobby' started by star_wolf_us, Aug 5, 2009.

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  1. star_wolf_us

    star_wolf_us Spanish Shawl Nudibranch

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    I just built a sump/refugium out of an old 20 gallon tall. I don't know how long to leave the light for the refugium on for. Is it 24 hours or will the refugium benefit from day/night like the main tank?:confused::confused::confused:
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  3. steve wright

    steve wright Super Moderator Staff Member

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    as you are already aware there are different schools of thought on this aspect

    some light them 24/7
    others run them 12 on 12 off - in order the plants can breath
    some that do run them 12 on 12 off run the fuge lighting in reverse of the DT lighting
    so when DT is on fuge light is off and come on when DT is off

    the reason for this is to try and maintain the PH at night - when the fuge lights are off , the macros breath oyxgen and release CO2 ( a reversal of the day time activity)
    CO2 levels can drop PH - so by running fuge lights in reverse of main lighting, they are trying to achieve a constant PH in their DT rather than the highs and lows that are often experienced in a tank with a fuge on same lighting cycle

    which is best?

    I have no idea but the reversed lighting scenario does appeal to me
    Steve
  4. Geoff

    Geoff Teardrop Maxima Clam

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    I use the reverse lighting,helps with heat issues also as you're not burning all the lights at once.
  5. lunatik_69

    lunatik_69 Giant Squid

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    This is correct. This man is too smart.....even for his own good.....lol

    I run my fug on a reverse lighting schedule from my DT. My fug runs from 10pm to 10am. I'm not comfortable running a refug 24/7, even if its only with cheato. Plants need a break, besides, its not normal.



    Luna
  6. Powerman

    Powerman Giant Squid

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    So I understand the thinking, but has anyone tested the reverse photo period out. I mean if you swapped it, how much would your PH be affected.

    I ran a reverse, but then due to other considerations, now just turn off for 8 hours during the day. I have also ran the same periods and didn't notice much of a change in my PH either way. Now I just dose my Alk all night long and ph stays 8.2-8.3
  7. mattheuw1

    mattheuw1 Montipora Capricornis

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    I run my fige lights for about 18hours on a reverse cycle from my display. so there are 3 hour overlaps where both lights are on.
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  9. lunatik_69

    lunatik_69 Giant Squid

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    My ph maintains between 8.0-8.1 during the night, but thats naturally. What I mean by that is, your ph stays between 8.2-8.3 only b/c your dosing alk. Its almost like saying that your ph is a false reading. My ph is between 8.1-8.3 during the day, so its pretty stable during a 24 period. I hope that made any sense.



    Luna
  10. Powerman

    Powerman Giant Squid

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    No... right. I realize thats why it is now... but before, I was not dosing Alk like that. It was before using 2 pt. I did not find the reverse period to affect PH much. So now, because of that, I dose Alk all night with the AC jr. See what I'm saying?
  11. lunatik_69

    lunatik_69 Giant Squid

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    Yeah, I understand. But if you want an accurate "true reading" or to find out if the reverse lighting works, try it without the dosing of Alk.


    Luna
    Last edited: Aug 6, 2009
  12. star_wolf_us

    star_wolf_us Spanish Shawl Nudibranch

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    OK! So this actually works out good. I've got a powerstrip with a timer that runs 2 DT lights and 2 NT lights. I'm going to run my fuge light in reverse then. Thanks All!!!