help with ph

Discussion in 'Water Parameters and Additives' started by cswhitehead, 14 Feb 2011.

  1. cswhitehead

    cswhitehead

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    i have been testing my ph lately and i have a ph of 7.8 lights off and 8 lights on. is this ok? or should i try to raise the ph a bit?
     
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  3. 459b

    459b Moderator MASA Contributor

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    you should try nd raise it to 8.3.
    what are you currently dosing to help with pH?
     
  4. Tony

    Tony

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    A tad low. What products are you using for your alkalinity?
     
  5. cswhitehead

    cswhitehead Thread Starter

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    im not dosing anything. i try rely on water changes to keep everything in check.
     
  6. 459b

    459b Moderator MASA Contributor

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    How often do you do water changes?
     
  7. Tony

    Tony

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    There's your problem. Your current method may work with an aragonite substrate and little or no calcium demand where you would allow the substrate to maintain your calcium, alkalinity and magnesium. However, if you have calcium demanding corals, a deep and poorly circulated tank or a tank with a lot of fish you will need to supplement something to maintain your alkalinity, calcium and magnesium.
     
  8. Tobes

    Tobes Retired Moderator

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  9. cswhitehead

    cswhitehead Thread Starter

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    i do at least a 50l water change every 2 weeks some times i do more but that depending on if i can collect water or not. i did a 70l water change two weeks back. will do another 50l either today or tomorrow.
     
  10. cswhitehead

    cswhitehead Thread Starter

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    i did double check my ph and i calibrated the pen just before testing it.
    my system is only +-300l including sump. i have two fish in it a few snails and hermits and i have a brain coral and zoas and mushrooms(it was one small one that i cut into 4 little pieces) so not much in my tank.
     
  11. 459b

    459b Moderator MASA Contributor

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    thats not frequent enough to be able to not dose anyhting. As Tony pointed out, you will need to dose to keep pH/alk/Mg/Ca constant.
     
  12. cswhitehead

    cswhitehead Thread Starter

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    more info:
    tank started 13/12/2010
    tank: 1220x450x450 (aragonite and +- 25kg local liverock bought from marco)
    sump: 900x300x300 (skimmer reeftek ts2, dsb and cheato, return 3000l/h)
    lighting 4xt5 54w (2 x 10 000k 1 x actinic 1 x coral blue)

    salinity: 1.025
    ph: 7.8 - 8
    kh: 7.4
    ca:400
    mg:1350
    amo: 0
    nitrite: 0
    i dont have a nitrate test kit will get one soon

    i do sometimes drip kalkwasser.

    other problems: i have cyno at the moment and brown diatoms( think its normal as my tank is still young)?
     
    Last edited: 14 Feb 2011
  13. cswhitehead

    cswhitehead Thread Starter

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    i get my water collected by ski boat as the water here is dirty so i can only get water when the guy goes out. which is normally every second weekend depending on the weather
     
  14. cswhitehead

    cswhitehead Thread Starter

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  15. 459b

    459b Moderator MASA Contributor

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    kh is a little low.
    How often were you dosing kalk?
     
  16. cswhitehead

    cswhitehead Thread Starter

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    iv dosed it twice before i got the ca test kit i only got the ca test kit last week so was nervous to dose too much before i could test but since then i havent dosed it.
     
  17. cswhitehead

    cswhitehead Thread Starter

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    so whats the best way to raise the ph and kh????
     
  18. 459b

    459b Moderator MASA Contributor

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    i used pH buffer to raise my pH then dose kalk daily to maintain KH.
     
  19. cswhitehead

    cswhitehead Thread Starter

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    thanks 459b
     
  20. Tony

    Tony

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    Kalk powder will raise your alkalinity and calcium simultaneously. However, you can use bicarb of soda to raise you alkalinity and calcium carbonate to raise your calcium independantly. Your parameters bar the p.H dont seem out of control. The calcium could use a little nudge in the right direction (420-450ppm) but it's not bad. Your K.H in my opinion is perfect. Your tank isnt that deep as deep poorly circulated tanks tend to hold CO2 so I can eliminate that. My only thing is to check your p.H pens accuracy with another reefer or a pet store. The aragonite in your tank will buffer your p.H so I can only think that your meter is slightly inaccurate. Calibrating the pen can be tricky. To calibrate your meter properly, you need to soak your meter in RO water for a day to remove any build up then shake it off well to remove any water. Each calibration solution must be placed in a seperate glass and the meter placed in each solution. Leave the meter to stabilize then adjust the meter till it rests on 4.1 or 7.1 depending on your solutions. The meter should be well rinsed in RO water between each calibration fluid and shaken out properly to remove any residual water around the probe.


    To answer your earlier question, diatoms are caused by silicates which is probably in your water. The diatoms use silicates to form their skeletons. A phosphate sponge will help eliminate that
     
  21. cswhitehead

    cswhitehead Thread Starter

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    tested my ph again now and its 8.2 so maybe i was checking to early after lights on? will get a phosphate sponge to help with the diatoms. and i will drip kalk tonight.
     
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