Wooden roots can be very useful in an aquarium. It adds a decorative touch that makes the aquascape seem more natural, and some fish species appreciate some wood in their setup. After a while, beneficial bacteria will also colonize the wood. Unfortunately, it's not as simple as just plopping that piece of wood in the tank, which would cause the wood to release tannins into the water. Be sure to prepare the wood before adding to the aquarium.
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