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post #1 of 5 (permalink) Old 01-07-2006, 02:07 AM Thread Starter
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PH Dilemna

My tap water is a PH of about 8.0

My tank water is testing a PH of ~6.2, how is this possible?

I just did a 50% water change ~2 weeks ago.

150G River Tank - 30+ Clown Loach, 6 Botia Striata, 6 Botia Dario, 4 Schistura Manherti, 2 Misc Rainbow, 3 Tiger Barb, 3 SAE, 2 Bristlenose
75G Planted - Lots of Cherry Shrimp, Amano Shrimp
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post #2 of 5 (permalink) Old 01-07-2006, 02:11 AM
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Is that a resting pH on the tap water?

Do you have CO2 injection?
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post #3 of 5 (permalink) Old 01-07-2006, 02:17 AM Thread Starter
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I do not use CO2. I have an Eheim 2217 and a Emperor 400 cleaning the tank. I havent used any fertilizers lately. I havent lost any fish in months but Im getting scared of this low ph.

That was a test of my tap water straight from tap, I will test it after letting it sit 12-24 hrs from now.

150G River Tank - 30+ Clown Loach, 6 Botia Striata, 6 Botia Dario, 4 Schistura Manherti, 2 Misc Rainbow, 3 Tiger Barb, 3 SAE, 2 Bristlenose
75G Planted - Lots of Cherry Shrimp, Amano Shrimp
[/SIZE]
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post #4 of 5 (permalink) Old 01-09-2006, 01:48 PM
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I would also test the carbonate hardness in the tank, and from your rested tap water (not that resting affects Kh...). If the Kh in your tank is significantly lower than the tap, that'd explain the pH difference.

Then we'd need to determine why Kh was crashing. What's your normal water change routine like? 50% every 2 weeks, religiously?
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post #5 of 5 (permalink) Old 01-11-2006, 01:13 AM
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What type of plants do you have in your tank and have you been testing your tap water's KH? Sometime public water supplies differ in the KH of the water. Mine varies about 1 degree between spring and fall. Depending on which part of the country you live in, your water supplier may use either groundwater or surface water, or both.

Here in Dayton, the city uses Calcium Hydroxide to soften the water, which reduces the Total Alkalinity of my water from 270ppm to 72ppm. This procedure also strips quite a bit of calcium and magnesium from the water. I assume this would also allow for some human error and cause a difference in KH of your tap water.

Matt

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