Are they softwood or hardwood? If soft wood then most likely no, if they are hardwood yes. If hardwood you would need to fully dry and debark them. Then before you are ready to add them to your tank you can boil the piece or soak it in warm-hot water, this helps the tannis leach out in the pot or tub and not your tank. If they float in your tank you can water log them in a bucket, or use a rock to hold it down in the tank water logging it that way
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