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Your post is still rather unclear.
If a tree branch has been dead for 5-6 years it is almost certainly aquarium safe, provided it's not a cedar or something similar. Some compounds in cedars could still prove toxic, and I'd be unsure whether it would be safe.
If a tree branch has been dead for 5-6 years it is almost certainly aquarium safe, provided it's not a cedar or something similar. Some compounds in cedars could still prove toxic, and I'd be unsure whether it would be safe.
