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#1
08-05-2009, 07:23 AM
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Boost your Alkalinity up with some baking soda and your pH will raise shortly after. Add only enough to increase it about 1 dkh at a time by using this calculator: http://reef.diesyst.com/chemcalc/chemcalc.html
Also read this for a better understanding. Low pH: Causes and Cures http://www.reefkeeping.com/issues/2004-09/rhf/index.php
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"We shall dive down through black abysses... and in that lair of the Deep Ones we shall dwell amidst wonder and glory forever." - H.P. Lovecraft Old 120gal Tank Journal New 225gal Tank Journal May 2010 TOTM The 10th Annual Prince George Reef Tank Tour 
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#2
08-05-2009, 01:35 PM
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IME, the vast majority of tanks do not have issues with pH. The rpH ange of 7.8-8.3 is acceptable for most marine life, and the lower range is not uncommon for those who use calcium reactors.
Rather than concerning yourself with correcting the pH reading you got, I would be more concerned with minimizing the fluctuation in pH (which occurs overnight when your lights are off). Do you have a small light on your HOB refugium on a reverse-daylight schedule?
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I'm out. 
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#3
08-05-2009, 05:38 PM
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I have a light on my fuge that is on during the day (12 hrs on/12 hrs off). Are you saying that this should be reversed and have it on at night and off during the day?
I have kept a log book since starting the tank, and my Ph has been 7.8 now for over 2 months. Actually, since switching to DD salt as opposed to Instant Ocean, most of my parameters have been pretty stable with my Mg and Ca only fluctuating slightly (i do have a light load of Corals and inverts though).
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Fluval Osaka 41g sumpless tank, 250w MH + 130W PC , DIY HOB refugium, Tunze 9002, Koralia 2, Koralia Nano Toad Stool Colt Coral Purple Shrooms Red Shrooms Candy Cane Coral Hammer Coral Moon Coral Copper Banded Shrimp..and growing
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#4
08-05-2009, 05:41 PM
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You bet - the light on the fuge should be on when the lights on the main tank are off to help stabilize pH, known as reverse-daylight lighting (to promote photosynthesis when the main lights are off).
Quote:
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#5
08-06-2009, 01:17 AM
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I agree with Wicked Frags, don't try to adjust it directly by altering alkalinity or using pH buffers. Another thing to consider is that having CO2 in the house will lower the pH of the tank. Same with not having a protein skimmer. Excess nutrients will also cause the pH to drop. Something as simple as adding an air pump in the sump will often do the trick if you don't have a skimmer. Your SeaClone is probably doing the trick by adding bubbles, although I question how effective it is at removing nutrients.
You can also take a peek for some more info on pH in the article I wrote (link in sig).
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