pH differences b/w tap & Tank water - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 13 Old 09-29-2013, 06:02 AM Thread Starter
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pH differences b/w tap & Tank water

Ok so I set my tank up 7 days ago. its a 100L freshwater tropical with heater, top filter with the carbon/bioballs/ceramic rings. It has painted gravel, 3 plastic ornaments and an airstone and 3 live plants. Ive got two fish in there.

My ammonia, nitrites & nitrates are all 0.
My pH though is 8.0.
my tapwater pH is 7.0.
My water hardness (i looked it up on the water supplier website) is 16 mg/L which i believe is soft.

So any reasons why my pH is high? I was told it could be from the type of gravel as painted gravel is often cheap quartz and that raises pH.

My local aquarium said to add 30% change with rain water (only once off and not to keep changing with rain water): it lowered my ph to 7.4.

But why is there such a difference between tap water and my tank and what should I do? change the gravel?
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post #2 of 13 Old 09-29-2013, 06:18 AM
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Did you test your tap water yourself? If so how did you test it? Also if you did what type of test kit did you use?

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post #3 of 13 Old 09-29-2013, 06:19 AM
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Btw (sorry for the rudeness there.) Welcome to Tropical Fish Keeping!

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post #4 of 13 Old 09-29-2013, 06:22 AM
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hello and welcome.

when you set up a new tank,hide an extra
sponge or two behind some decor,that way you have
something seeded for you next filter.
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post #5 of 13 Old 09-29-2013, 06:24 AM Thread Starter
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Thanks!
I tested the pH myself with the API master kit tester using the ph & high pH test.
I took it straight from the tap but read i should let it sit for 24 hours before testing. So i just put some tap water in a cup then to test tomorrow.
I didnt test the water hardness as i dont have that kit.

I also put some gravel from the tank in a bowl with tap water to test tomorrow to see if the gravel is affecting the pH.
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post #6 of 13 Old 09-29-2013, 06:32 AM
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OK was going to suggest that you do exactly what you are doing. If you test the PH without letting it sit or shacking the crap out of it first it won't give ya true reading due to some gases in the water. Its also not a bad idea to test the gravel like you are. When you get the results tomorrow and they are still the same we can try to figure out something else.

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post #7 of 13 Old 09-29-2013, 06:37 AM Thread Starter
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Thanks! Will let you know results tomorrow.
The aquarium shop I went to today were really helpful and seemed very knowledgeable but just thought Id get other advice as well.
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post #8 of 13 Old 09-29-2013, 09:05 AM
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if shop advise tallys with what advise you get here,your on a winner.

when you set up a new tank,hide an extra
sponge or two behind some decor,that way you have
something seeded for you next filter.
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post #9 of 13 Old 09-29-2013, 07:06 PM Thread Starter
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Ok so I let the tap water sit for 12hours:

Tank-
pH 7.4 - 7.8 (had 30% rainwater change yest as pH was 8)
Ammonia 0
Nitrites 0
Nitrates 0

Tap: ph: 7.0

Tap water w aquarium stones: pH: 7.4 - 7.8.

Im guessing its the stones raising the pH in the tank?
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post #10 of 13 Old 09-29-2013, 07:15 PM
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Depending on what they are they can. The only way to know for sure is to swap them out for something else but that's a lot of work just to see *if* that is what it is for sure. You have nothing else beside plastic ornaments? I hate to suggest you swapping the gravel out and that not be it. Soo hopefully someone else will chime in and have an idea.
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