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Old 02-16-2009, 05:12 PM   #1
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Up, **** pH, up!

Ok, I've been trying to maintain a pH of around 8.2 in my tank for a while now (based on the datasheets I've read all of the fish I have like 8.1 to 8.4 range) but I just can't get it up. I tried 2 different "pH Up" products, the first one worked for about 8 hours, and now I have "Marine Buffer" stuff, but the pH keeps resetting every day to about 8.05.

I have a 2L plastic bottle (thoroughly washed) that I poked a small hole in the bottom so I can drip the solution slowly into the tank over the period of about 3 hours. I mix the recommended amount, and according to my digital meter the pH goes up to a nice 8.24, but within about 12 hours it's back down to 8.05.

I've got a 75 gallon tank with 95 lbs of rock (65lbs of fiji, 30 of spiderwick) and 80lbs of "live sand". Ammonia and Nitrites are negligable, Nitrates are fine too. Carbinate hardness is 250 (14dKh), General Hardness is about 350. Salinity is 1.023.

The fish don't seem to care, but I'd like it to be at least 8.2. Does it really matter? Is the hardness too high? If I keep dousing the tank will it eventually get higher? Is it bad to keep exposing the fish to pH changes like this every day? Is there a better way to raise the pH?

Thanks! (I did search but didn't find anything terribly useful)
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Old 02-16-2009, 06:21 PM   #2
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The fish don't seem to care, but I'd like it to be at least 8.2. Does it really matter?
No. Your pH is fine at 8. Anywhere from 7.8 to 8.4 is good.
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Is the hardness too high? If I keep dousing the tank will it eventually get higher?
Yes, and yes it will get higher if you keep dosing. Stop all dosing.
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Is it bad to keep exposing the fish to pH changes like this every day?
No, changes in pH throughout the day is common.
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Is there a better way to raise the pH?
Your pH is fine, but if want something to read....
Low pH: Causes and Cures
The "How To" Guide to Reef Aquarium Chemistry for Beginners, Part 3: pH
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Old 02-17-2009, 02:27 PM   #3
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Thanks for the info. If 7.8 to 8.4 is fine, why do all references I can find recommend 8.1 to 8.4 then?
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Old 02-17-2009, 02:44 PM   #4
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I agree with ccCapt. I've always read that a stable ph which is lower than the ideal (though I don't think 8.05 is too low) is better than a constant swing up and down. I don't think 8.05-8.2 is an abnormal swing. My ph is 8.2 most of the day and drops to about 8.08 at night. Is the water at the top of your tank agitated by a power head? Agitated surface water will help raise your ph.
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Old 02-17-2009, 04:47 PM   #5
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I agree, stability is better than "perfect", within reason. Do you have a cover on the tank?
Added surface ripple will increase your pH. I tried the buffering but it became a huge pain. I added a ph and pointed it to the top for more surface ripple and have not worried about it since.
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Old 02-20-2009, 06:32 PM   #6
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Anyone?
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Old 02-20-2009, 06:40 PM   #7
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What's the question?
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Old 02-20-2009, 06:42 PM   #8
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I thought your question was answered. Hmmm...what was the question?
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Old 02-20-2009, 06:53 PM   #9
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Quote:
Originally Posted by Telek View Post
Why do all references I can find recommend 8.1 to 8.4 then?
I think he is refereeing to this question guys....
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Old 02-20-2009, 07:08 PM   #10
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Ah...

Recommended is not always what happens in reality. My tank pretty much stays at 8.1 but it is 3 years old. Stability is the key. 7.8-8.4 is the target range but stability is what you are after.
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