How to know if rocks are safe?

iamgoldfish

I'm in the middle of a makeover of my goldfish tank (just a noob lol) and I have put rocks from my garden into my betta tank before, so I was going to do it again for the godfish, but the only rocks I could find were different. Very lumpy and ragged- they look nice but do they contian chemicals that could change the water? Is there a test to see if the rocks are safe...something with vinegar? I don't know, just need some advice
 

SnookusFish

Try a bit of vinegar, if it fizzes then the stones contain lime (calcium) these minerals can harden your water
 

iamgoldfish

Ok thanks will do
 

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