PH Super High

Discussion in 'Reef Chemistry by Randy Holmes-Farley' started by Bmartinez76, Jan 9, 2017.

  1. Bmartinez76

    Bmartinez76 Well-Known Member

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    My tank has always struggled with PH, I averaged between 7.87-7.98 is, but hardly ever above 8. Recently we started getting colder weather than normal here in Florida and my PH has skyrocketed to 8.12. I tested last night and my ALK was at 8.7, Cal 450, Mag 1300. I am dosing 60ml of ALK using a APEX DOS (through the day on alternating schedule of CAL) and Cal i dose 42ML. I've been dosing Kalk as well (30ml) to maintain parameters. My tank is just about 1 year old now. Should I be concerned about the PH swing? I don't see anything fainting or convulsing, but I'm sort of a rookie and want to make sure I'm taking the appropriate steps to maintain my reef tank.

    One other thing to note is that previously I was not able to grow cheato in my refuguim and as of late it started to grow nicely.

    This is my Kalk programming in case it helps.
    Fallback OFF
    OSC 040:00/001:08/018:52 Then ON
    If pH > 8.35 Then OFF
    If KalkSw CLOSED Then OFF

    Any input advice would be appreciated.

    upload_2017-1-9_13-48-9.png
     
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  2. Brew12

    Brew12 Well-Known Member R2R Supporter R2R Excellence Award Reef Squad Article Contributor Partner Member

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    8.12 is not high at all.
    It is possible that the chaeto growth is pulling CO2 out of the tank and causing pH to go up.
     
  3. redfishbluefish

    redfishbluefish Stay Positive, Stay Productive R2R Supporter R2R Excellence Award Reef Squad

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    Your pH is just fine. What is causing the change (assuming no testing error) is CO2 in the water. What is odd is that pH usually drops in winter with the house closed up and a heater running. But again, no issue with that pH.
     
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  4. Bmartinez76

    Bmartinez76 Well-Known Member

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    Great thanks for confirming. The house is currently at around 69-72 with the cold air. I'm on forced heat with my house generally just using the cooling all day (I didn't turn on the heater during the day, only at night for the kids). As a technical person my first thought is what has changed in my setup and going from there. I added 2 mangroves to my refugium and that's when I noticed my cheato has grown substantially and assumed that might have something to do with it.
     
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  5. moray69

    moray69 New Member

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    Check your ph probe calibration. Just in case....
     
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  6. Bmartinez76

    Bmartinez76 Well-Known Member

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    Planning on that, but didn't have the solutions on hand. Will be getting some later this week.
     
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  7. Specfishin

    Specfishin Well-Known Member

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    Fwiw, I'm in Florida and my ph has been laying low from 7.4-8 until the cold hit. Now its sitting steady and slowly rising anywhere from 8.3-8.5.
    I was just getting ready to run a fresh air intake line to my skimmer.my ph was running low with the skimmer off for a few days at a time. Now I leave it on except feeding
     
  8. Specfishin

    Specfishin Well-Known Member

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    Oh I also swapped my fuge lighting from 24/7 to opposite display. I really think between florida homes being couped up with ac on , we dont get a very good air exchange from outdoors
     
  9. arman

    arman Well-Known Member

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    Hey guys what are yr ideas about the results of much higher ph on reefs and fishes?for example ph around 8.5 to9
     
  10. redfishbluefish

    redfishbluefish Stay Positive, Stay Productive R2R Supporter R2R Excellence Award Reef Squad

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    That's called testing error or someone dumping something nasty into your tank (a very strong base). Otherwise, it can't happen.
     
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  11. arman

    arman Well-Known Member

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    Im dosing kalkwasser to my tank very carefully, i wanted to know if i dose it with a dosing system in my tank in different times with 40ml every time(24 times a day) could raise my ph up to 8.5?
    I use two teaspoons in 1 gallon to make the solution.
     
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  12. Brew12

    Brew12 Well-Known Member R2R Supporter R2R Excellence Award Reef Squad Article Contributor Partner Member

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    I have to ask, why do you want your pH that high?

    Once you get above 8.4 you will start getting some precipitation of Calc and Alk in the form of Calcium Carbonate. You will need to work very hard to keep those parameters where you want them. It will also likely require a CO2 filter along with the Kalk to keep enough CO2 out of your system.
     
  13. redfishbluefish

    redfishbluefish Stay Positive, Stay Productive R2R Supporter R2R Excellence Award Reef Squad

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    With saturated kalk you could drive your pH above 8.5....but you don't want that....you're either adding too much or too fast. And @Brew12 ,without looking up the chemistry, I believe you want and need the CO2 in the tank so that the hydroxide can react with the carbon dioxide to form carbonate. But I agree with Brew that you're now going to start getting precipitation of calcium carbonate and other goodies. I'm not a kalk user but believe Randy is and I'm sure he can clarify the chemistry and pH issue..... @Randy Holmes-Farley
     
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  14. Brew12

    Brew12 Well-Known Member R2R Supporter R2R Excellence Award Reef Squad Article Contributor Partner Member

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    The CO2 in the tank combines with the water to form Carbonic acid which drives down pH.
    CO2+H2O = H2CO3

    The Kalk works by converting some carbonic acid into bicarbonate.

    pH is an equilibrium reaction in a tank between carbonic acid, bicarbonate, and carbonate.

    H2CO3 <-> H + HCO3 <-> 2H + CO3

    If you add CO2, it shifts the equation to the left and lowers pH. When you add Kalk {Ca(OH)2} it dissociates into CA + 2OH. The OH reacts with the carbonic acid (H2CO3) to become bicarbonate which shifts the equation to the right and raises pH. OH + H2CO3 -> 2HCO3
     
    Last edited: Jan 13, 2017
  15. Brew12

    Brew12 Well-Known Member R2R Supporter R2R Excellence Award Reef Squad Article Contributor Partner Member

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    My inner geek came out.. didn't it? :rolleyes:
     
  16. redfishbluefish

    redfishbluefish Stay Positive, Stay Productive R2R Supporter R2R Excellence Award Reef Squad

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  17. Brew12

    Brew12 Well-Known Member R2R Supporter R2R Excellence Award Reef Squad Article Contributor Partner Member

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    That is one of my favorite ones. Fascinating on how you can use Kalk to raise pH but you can also use it in combination with vinegar to drop pH.
     
  18. G8trBait16

    G8trBait16 Well-Known Member R2R Supporter Partner Member

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    I have a DIY CO2 scrubber connected to my skimmer. I am getting 8.25 at night and 8.5 during the day. I live in Central FL, the CO2 scrubber has helped out tremendously especially during the summer months when you couldn't open the windows/doors. Recently I have been keeping the windows and sliding doors open in the back when I get home from work, until I go to work the next day.
     
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  19. arman

    arman Well-Known Member

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    I dont want to raise it that high. I meant that if it could be that high by the dosing program i mentioned.
     
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  20. Brew12

    Brew12 Well-Known Member R2R Supporter R2R Excellence Award Reef Squad Article Contributor Partner Member

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    Ah, ok. Yes, it is possible. It is also unlikely.
     

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