Bark is often used in aquariums where no bottom feeders are present. The advantage of bark over leaves in the aquarium is that bark does not contaminate the water as much since it keeps it form and does not fall apart. Bark does still give off all the good tannins in the aquarium.
Large pieces of round catappa bark. These pieces are much larger and heavier than the round catappa bark of tantora. +- 13 cm long and +- 2,5 cm in diameter. Thick bark!