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  1. S

    Low Ph

    DonW, I changed 175 gals (100 gal tank) when I OD'ed the Alk, had significant die off. Comming round now and getting ahead of the diatoms, so I figured on backing off, let things settle down, then put the carx on slowly. Got water made now for a couple of 25% changes. Hopefully with it, Ca/Alk...
  2. S

    Low Ph

    DonW, Backed off on the calc reactor, then shut it off, the threads about balance were interesting. Ph is now more stable at 7.8 to 8.0 (fresh calibration, lab grade), 10.0 Alk and 410 Ca. Intend to use the calculator and recipe 1, keep them optimum, see if the Kalk brings the Ph up slowly...
  3. S

    Low Ph

    Give it a try, thanks Don
  4. S

    Low Ph

    25 bubbles/min CO2, 30 drops/min, 6.3 ph output from 2nd tower of ARM media, homemade second stage
  5. S

    Low Ph

    Don, Fisher Scentific instrument and cal fluids. Compared today, 7.7 morning at home, 7.8 at work (different instrument). Seem to be maintaining around 7.8 by increasing the make up water (+kalk). Can only do that so long. Any cleaning or activity in the tank seems to lower the ph. Have the...
  6. S

    Low Ph

    Get a high of 7.8 end of photo period (14 compacts), drops as low as 7.2-7.4. I don't think it's a issue but I'll try the cup of for co2 water trick.
  7. S

    Low Ph

    Hi, I'm suddenly having low ph isues, bad is low 7s, good is 7.8. Calcium 500, Alk 9.9 (Salifert). Don't test Mg, but added some recipe 1. I run make up RO through a homemade Kalk reactor, have a co2 calc reactor, home made 2nd stage. Electronic ph meter, lab grade calibration solutions. Skimmer...
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