Poll: Do you GFO?

Discussion in 'Reef Chemistry by Randy Holmes-Farley' started by USMA36, Feb 10, 2018.

?
  1. 24/7

    236 vote(s)
    31.3%
  2. Once a week

    5 vote(s)
    0.7%
  3. Once a month

    21 vote(s)
    2.8%
  4. Never

    322 vote(s)
    42.6%
  5. Only when "needed"

    171 vote(s)
    22.6%
  1. USMA36

    USMA36 Well-Known Member R2R Supporter Build Thread Contributor

    Joined:
    Feb 5, 2017
    Messages:
    510
    Likes Received:
    182
    Location:
    Northeast PA
    just curious who uses gfo and how often. Do you use a less than recommended dose for your tank size? How old is your tank? I had been running 3/4 cup high capacity gfo 24/7 through a BRS dual reactor as recommended by their reef calculator but I was stripping my water, well at least according to my Hannah checker and my corals. I recently changed it to 30 min on 30 off with about 1/3 the recommended amount and I am still at 0. I may take it offline for a bit and see what I end up at naturally. Tank is still new. Just about 1 year old mixed reef 100 total water volume. I’m hoping it doesn’t swing the other way too fast and anger the spa corals with dirty water.
     
    Tags:

  2. Pongo

    Pongo Active Member R2R Supporter

    Joined:
    Dec 27, 2016
    Messages:
    447
    Likes Received:
    498
    Location:
    Vacaville, CA
    My PO4 just peaked at 0.06 this week.
    Haven't needed GFO yet, but I keep a small reactor in the closet in case I do some day.
     
    cracker and HolisticBear like this.
  3. Ryan Rosales

    Ryan Rosales Member

    Joined:
    Mar 23, 2017
    Messages:
    66
    Likes Received:
    13
    Location:
    Palmdale Ca
    Yeah, you wouldn’t know when high PO4 is gonna hit you.
    Have one reactor hooked up, actually on stand by with a gate valve.
     
  4. Randy Holmes-Farley

    Randy Holmes-Farley Reef Chemist Staff Member Team R2R R2R Supporter R2R Excellence Award Article Contributor Expert Contributor

    Joined:
    Sep 5, 2014
    Messages:
    29,502
    Likes Received:
    17,046
    Location:
    Arlington, Massachusetts, United States
    I used it 24/7.
     
  5. madweazl

    madweazl Valuable Member R2R Supporter Build Thread Contributor

    Joined:
    Sep 19, 2016
    Messages:
    1,778
    Likes Received:
    1,623
    Location:
    Virginia
    Tank is 20 months old and I've never used it. PO4 is typically around .05 via Hanna ULR or .01 if you believe Triton more.
     
  6. andrewkw

    andrewkw Well-Known Member Reef Tank 365 Build Thread Contributor

    Joined:
    Jun 1, 2014
    Messages:
    542
    Likes Received:
    849
    Location:
    Ontario, Canada
    I use it 24/7 but I don't change it religiously. Carbon dosing is my main phosphate reduction method, I still run gfo and change it about every 1-2 months.
     
    DSC reef likes this.
  7. CypressReef

    CypressReef Member

    Joined:
    Apr 5, 2017
    Messages:
    12
    Likes Received:
    29
    Randy, how often to you change the GFO?

    Thanks
     
  8. Randy Holmes-Farley

    Randy Holmes-Farley Reef Chemist Staff Member Team R2R R2R Supporter R2R Excellence Award Article Contributor Expert Contributor

    Joined:
    Sep 5, 2014
    Messages:
    29,502
    Likes Received:
    17,046
    Location:
    Arlington, Massachusetts, United States
    The tank is down now, but I think it was typically 2-4 weeks. :)
     
    psychobilly07 likes this.
  9. Mark Gray

    Mark Gray Valuable Member R2R Supporter Build Thread Contributor Partner Member 2018

    Joined:
    Jul 13, 2015
    Messages:
    1,683
    Likes Received:
    1,262
    Location:
    Athens GA
    I have never used it
     
  10. jrwoltman

    jrwoltman Active Member

    Joined:
    Jul 2, 2017
    Messages:
    342
    Likes Received:
    544
    Location:
    Plainfield, IL
    Yes, I use Chemipure Elite (contains GFO) in conjunction with Purigen and swap them out every 3 months.
     
    psychobilly07 and DSC reef like this.
  11. saltyfilmfolks

    saltyfilmfolks Lights! Camera! Reef! R2R Supporter R2R Excellence Award Reef Squad Leader Photo of the Month Award Build Thread Contributor

    Joined:
    Feb 25, 2014
    Messages:
    24,741
    Likes Received:
    25,047
    Location:
    California
    Only in case of emergency really.
    I just bought my second 5 oz jar in eight years.
     
    DSC reef likes this.
  12. Zacco

    Zacco Active Member

    Joined:
    Feb 2, 2014
    Messages:
    393
    Likes Received:
    34
    Location:
    Pennsylvania
    I stopped using GFO and have gone to using Chaetomorpha Algae and a high powered Hydroponics/Aquaponics grow light in the sump refugium tumbled by a power head. SPS were suffering from the use of GFO (I was probably using way too much). Tank has never looked better since I made the switch and there is virtually no algae in the display tank. If you do use GFO, I am a firm believer that it should be used in moderation. 1 TBSP to every 4 gallons of water. There has also been studies that I've read that GFO has the potential to strip a number of transition metals (such as zinc,copper,manganese,ect.)
     
    a49panhead and Joseph Wright like this.
  13. Joseph Wright

    Joseph Wright Member R2R Supporter

    Joined:
    Jun 15, 2017
    Messages:
    38
    Likes Received:
    17
    Location:
    Lambertville N.J.
    Yes, when nitrates are low and I’m not dosing Red Sea no3/po4 reducer. The imbalance of those two kills off beneficial bacteria that process nitrate to nitrogen. When I get a nitrate spike( yes things die and cause this). I take out my gfo and run straight reef carbon in that reactor. Makes the water even clearer and crisper!
     
  14. Brew12

    Brew12 Electrical Gru R2R Supporter R2R Excellence Award Reef Squad Leader Article Contributor Build Thread Contributor Partner Member 2018

    Joined:
    Aug 14, 2016
    Messages:
    11,705
    Likes Received:
    17,938
    Location:
    Decatur, AL
    DSC reef likes this.
  15. Peng

    Peng Active Member R2R Supporter

    Joined:
    Feb 9, 2016
    Messages:
    313
    Likes Received:
    232
    Location:
    Bellevue, WA
    New tanks don’t have any need for GFO. The story goes like this - a person sets up a new tank, saw some algae, set up GFO, corals go pale, no coralite algae, corals die, the person wonders why, spend more money and add amino acids and vitamins... I don’t wanna be a conspiracy theorist but I’m really wondering who pushed these trends. The first thing many new comers worry about is how to eradicate NP.

    GFO/PhosGuard/ Cheato etc are problem solvers. If you don’t even have a problem, do not use them. For a new tank having algae and brown dino is normal. If you test 0 on phosphate it means you need to take that thing off. Many reef tanks with a good skimmer never end up needing one because phosphate never goes out of range. But I keep seeing a lot of people asking why their P is zero and why their acros are pale and not growing. This hobby used to encourage people to aggressively tackle nutrient problems by prophylactically setting up carbon-GFO reactors and oversized skimmers plus refugium and some even took pride of showing zero NO3 and zero PO4. That age is gone but old articles and posts continue to haunt.
     
    Last edited: Feb 10, 2018
    FutNA, NY_Caveman, UpNorthTom and 3 others like this.
  16. Hitman

    Hitman Active Member R2R Supporter Build Thread Contributor

    Joined:
    Jul 10, 2017
    Messages:
    346
    Likes Received:
    185
    Location:
    Arkansas
    BRS high capacity GFO runs 24/7 about 1/2 cup max.
     
  17. Scorpius

    Scorpius Valuable Member

    Joined:
    Mar 6, 2017
    Messages:
    1,641
    Likes Received:
    1,436
    Location:
    Northwest Indiana
    GFO removes more than just phosphates. Ever time I use it no matter how much/little I run I do major havoc to the ecosystem of my tank. I try not to use it now.
     
    Frikkie and Zacco like this.
  18. Randy Holmes-Farley

    Randy Holmes-Farley Reef Chemist Staff Member Team R2R R2R Supporter R2R Excellence Award Article Contributor Expert Contributor

    Joined:
    Sep 5, 2014
    Messages:
    29,502
    Likes Received:
    17,046
    Location:
    Arlington, Massachusetts, United States
    I agree it removes some other things (e.g., silicate and organics, maybe aluminum), but is there a specific thing you were worried about?
     
  19. Zacco

    Zacco Active Member

    Joined:
    Feb 2, 2014
    Messages:
    393
    Likes Received:
    34
    Location:
    Pennsylvania
    I'll second this. You have to be careful using this stuff because it can cause an imbalance in your tank. I lost a few colonies of Acro's using too much GFO. That's why I've switched to just running Chaeto and a some Red Dragons Breath Macro in the display tank. Going the all natural route has worked wonders for me.
     
    Last edited: Feb 10, 2018
    SteadyC and hyprc like this.
  20. amazongb

    amazongb Active Member

    Joined:
    Feb 13, 2017
    Messages:
    110
    Likes Received:
    91
    Location:
    Redlands, CA
    I used GFO but have recently converted my two little fishies reactor to a home-made algae reactor. I've been logging test results daily, and so far, I'm very impressed. When I disconnected my GFO, PO4 shot up from .04 to .20. I installed the reactor and a week later, PO4 is back down to .06.
     
    Zacco likes this.
Draft saved Draft deleted

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice
Loading...