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Trees and leaves fall into the water and release enough tannins that some rivers and streams become almost black
Nitrite itself is in turn broken down into nitrate
Individually adjustable: Water flow rate can be adjusted on the inflow and outflow adapter
Dimensions (L x W x H)mm85 x 51 x 116
Flexible: Can also be installed horizontally
Structure Wood Size:18-20cm Trees and leaves fall intoProduct Description This Natural Wood has a flat base so you can easily attach to the bottom of the aquarium. Add some extra height into a scape the detail is striking on this wood. Size may vary 18cm 20cm, 21 30cm