Will these type of rocks raise PH?

[flatty]

I seem to have a relatively high PH right out of the tap but it seems even higher in tank. I am wondering if rocks like these could be raising PH? Kind of hard to tell with the testkit but I am assuming it's about 7.5 given the blueish color on the API kit.

 

[captaincritical]

7.5 is actually a pretty neutral pH. I would love for my pH to be 7.5!

The rocks you have don't look to me like they'd be a problem, but you might want to take one out of the tank and test it with vinegar just to be sure. If you pour vinegar over it and it fizzes, it's either limestone or something with similar properties, and could be raising your pH.

Your tap water could also have a pH of 7.5. Reading it right out of the tap isn't always accurate. Set some tap water out, stir it a few times for about a day, and then test for the true pH.

 

[flatty]

I suppose I can try that. Just keep seeing recommended PH's around 7 so I assumed mine was high comparatively.

 

[captaincritical]

Mine sits around 7.8 - 8.0 most of the time. Still, it couldn't hurt to test the rocks. I accidentally put limestone in my tank once. Luckily there were no fish in it!

 

[flatty]

Thank you. Will do the test and find out for sure. I would assume I need to let the rock dry first?

 

[captaincritical]

No problem! I did my tests with wet rock without any issues. It's a pretty noticeable reaction. Almost sounds like a freshly opened can of pop.