Is this rock safe and how can i find out if it is?

Panzerammer

Hi so i recently found some rocks in my local river (the whiteriver in South Africa to be exact) how do I know if they are safe to use in my aquarium?

I have boiled them and washed them but I just want to be sure before I do anything.
 

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WRWAquarium

Hi

The best way to know if rocks are inert and safe if to drop some vinegar on them and see if it fizzes. If it fizzes it is best not to use as they will slowly alter water PH and hardness.
 

Panzerammer

Hi

The best way to know if rocks are inert and safe if to drop some vinegar on them and see if it fizzes. If it fizzes it is best not to use as they will slowly alter water PH and hardness.
Thanks
Hi

The best way to know if rocks are inert and safe if to drop some vinegar on them and see if it fizzes. If it fizzes it is best not to use as they will slowly alter water PH
Hi

The best way to know if rocks are inert and safe if to drop some vinegar on them and see if it fizzes. If it fizzes it is best not to use as they will slowly alter water PH and hardness.
Thanks
 

MacZ

Definitely not a form of limestone, so there should be no influence on hardness and pH. No guarantee it doesn't do anything else, it is a bit shiny like some volcanic ores.
 

A201

Almost any rock is aquarium safe. The exceptions are metallic rocks, oil Slate & grainy rocks.
I agree with MacZ, the pictured rock looks igneous.
 

Panzerammer

So I did the test and nothing happened I tried scraping the rock nothing happened so I'm assuming it's safe? Well like Macz said there is no guarantee... but I really do appreciate the help thank you all
Oh and I wanted to show my final setup with the rocks now I'm a bit more confident using them thanks to you guys
 

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