05-06-2011, 05:15 PM
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Grapewood is actually suppose to be aquarium safe, though it floats and breaksdown much faster then the aquarium stuff. I personally would not recommend it, reason is I bought some from petsmart years ago that completely crashed a tank in less then 24 hours. Seems they like to treat that wood with something, since no normal wood should cause the readings I saw from that. A simple test if you want to use it is to soak it in a bucket or bin of water all by itself. Then test the water for ammonia and nitrite after 48 hours. If readings are good it should be fine. It should be really obvious if its not from what I experienced.