Safe rocks for a freshwater aquarium

[Evil426]

I collected a number of rocks from my creek in front of my house. I scrubbed them and boiled them for 30 minutes. I then figured I should check and see if I need to worry about pH levels changing, and I could not find any exact information.

Here is all the info I have on the rocks:

Taken from a stream in Richmond, VA, USA

Some are white and sort of egg shaped.
Some are more jagged and sort of a darker tan.
Some are most definitely granite.

Any help/advice would be greatly appreciated! Thanks in advance!

 

[Fishyfanatic]

Drop vinegar onto the rocks. If it bubbles, don't use themin the tank.

 

[Evil426]

Won't that only tell me if there is calcium on the rock? I'm not too concerned about water hardness as the water in my area is fairly soft...

 

[Fishyfanatic]

Yes, it will tell you if the pH will be altered by the rocks. Do you have pics of the rocks?

 

[Evil426]

I will post pics shortly...

 

[chinoanoah]

Haha. how shortly?!

 

[eah]

When I wanted to make sure that the rocks I used to build a little cave were safe I soaked them in a bucket for 2 weeks and checked to make sure that the PH wasn't affected. I've read that using the vinegar trick isn't always sufficient.