12-08-2012, 07:28 PM
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Some wood should never go in a fish tank. Coniferous for example, but there are others; not knowing anything about this particular tree, I can only caution you.
Oak is fine, and beech. There may be others, but these two are frequently mentioned so I know they are safe, as far as the wood itself. But, they must be thoroughly dead/dry. Never cut branches from a live tree; the branch has to come off the tree and lie on the ground or wherever until it has completely dried out. If you cut a branch off, leave it in the air until it is completely dry/dead.
Aside from the above, one has to be sure the collecting site is safe. Pesticides, fertilizers, oils, chemicals... always collect wood from a forest where there is no chance of any of these. Again, I can't say the named tree is safe, no matter where you get it.
Other issues with wood are pathogens, parasites and fungi.