09-16-2010, 03:56 PM
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Generally, most people reccomend not to use driftwood or rocks that you find.
Do so at your own risk.
Of course, I'm not saying I've never done it... Don't trust the vinegar test. I would put the rock in a jar or bucket of water and see if the ph/kh/gh changes. If it stays the same after a week, then you'll probably be ok. I do agree, make sure there is nothing dark red or metallic in the rock that you can see.
As for the wood, you have to be a bit more careful... Look for 'old' wood. Most of the older wood is under water, so it might be tricky...
You'll need to brush the wood with a metal brush, boil the wood, then brush it again to get off any soft areas.. After that, you soak it in water some more. If the water turns too brown, you might want to boil it again. (Boiling causes the wood to release tannins faster, like a tea bag.)