ph too low - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 4 Old 12-31-2010, 02:31 PM Thread Starter
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ph too low

I have a 12 gallon fresh water tank, my ph is almost nonexsistent. My home tap water is perfect. I have nothing in the tank except fake plants and gravel. I did have sponge bob figures but took them all out. I add ph stabilzer but it does nothing. I have neons, angels and mollies in the tank. When i do a water change ph will go up a little and than drop down. I have no real plants and no wood in the tank. Can anyone help? tank is over a year old and i always have this problem, nobody knows Why.
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post #2 of 4 Old 12-31-2010, 11:44 PM
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Try adding some holey rocks, and I believe drift wood would help. Not sure what is lowering your pH though.
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post #3 of 4 Old 01-02-2011, 09:56 AM
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Just to make sure, are you using test strips or the liquid test for pH? and if your using the liquid your testing with regular pH tester , and not High pH tester right?

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post #4 of 4 Old 01-02-2011, 03:40 PM
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As a recent new member, welcome to Tropical Fish Keeping forum.

Now, to really offer suggestions, we need specific data. What is the pH of your tap water? This should be tested from a glass of water allowed to sit out overnight or the reading may be inaccurate due to dissolved CO2 in the water that needs to dissipate out.

Second, what is the pH of your tank (taken prior to a water change)?

It is natural for the water in an aquarium to become more acidic over time. The rate is affected by the hardness of the source water (tap water), objects in the tank (rock or gravel that is calcareous hardens water, wood softens water), fish load, live plants (you have none you mentioned, just noting plants for reference), and your regular maintenance (water changes). I can comment more on how this works once I know the specific pH of the tap and tank waters.

Do not use pH adjusting chemicals in the aquarium. These may or may not work (depending upon the hardness--if you know the hardness numbers for your tap water, this would help; you can get this from your water supply people) and if they don't a fluctuating pH is far more severe on fish than a relatively stable pH. Also, any chemicals going into a tank with live fish are going to impact the biological system to some degree, and these should always be avoided unless essential (medications for instance when absolutely needed).


Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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