Ph Fluctuations?

[CrazyDiamond88]

I have a 12 gallon planted tank, cycled.
 
Just did my tests.
 
pH - 7.0
Ammonia - 0
Nitrite - 0
Nitrate - 10 or 20, hard to tell.
 
I last tested pH about 6 days ago, and it was like 7.6.... that seems like a huge fluctuation to me... should I be worried?
 
The inhabitants - 8 pygmy cories and a betta - seem pretty happy...

 

[DevotedToDiscus]

That's not a huge fluctuation over a 6 day period, so no need to worry at all 

 

[CrazyDiamond88]

Awesome, thank you ^___^

 

[fm1978]

It's not too bad, no, but I'd be interested to find out why there's movement on it at all...
 
Do you have any rocks in there that could be slowly dissolving? Any other additives?

 

[DevotedToDiscus]

Did you initially test the water shortly after it had come from the tap?

 

[ech0o]

12 gallon planted tank, probably using co2 or dissolved carbon of some kind?

 

[CrazyDiamond88]

Yes I am using excel

Also I do have a rock that tends to crumble