Spiderwood is a light wood and will not leach as much tannins as a denser wood such as mopani.
Spider Wood is very cool looking driftwood perfect for any aquarium. Each piece is unique and has web like branches with lots of character. Would be great as a focal point in a smaller tank or add a few for larger tanks.
Spiderwood is a root from a water azalea. It is light weight and will need to be soaked for a couple of days in water to get it to sink. A nice benefit to spiderwood is that it doesn't leach as much tannins as other types of driftwood, so your tank water will stay clear.