AkvaStabil Driftwood for Freshwater Aquarium 15-23cm 100% Natural product so shape, look and size will vary - see us in store to grab the piece you like Big pieces of Mangrove driftwood for freshwater aquarium. We recommend soak in water at least 1 week before introducing in fish tank. Use Seachem Purigen in the filter to obtain maximum water clarity after installing the driftwood in the aquarium.