Driftwood is an essential component for decorating a naturalistic aquarium. Congo Wood Driftwood is an excellent choice for aquascaping. This thick, chunky wood is an excellent choice for placement in all areas of the aquarium. This type of driftwood is highly variable, but it always has a very complex appearance. While many retailers sell artificial pieces of simulated driftwood, our pieces are REAL Congo Wood! We are pleased to be able to offer pieces of all sizes to fit the smallest to largest aquariums. In addition to providing dramatic, natural scenery in the aquarium, driftwood plays in an important role in the wellbeing of any aquatic environment. It provides shelter for aquarium animals and it can serve as an anchor for plants such as Java Fern, Anubias, and Java Moss or other mosses. Each Amazon Wood Driftwood piece is unique and will make an attractive addition to any freshwater aquarium! All of our aquarium driftwoods and rocks are treated for aquarium use after simple rinsing. Some driftwoods can initially release tannins in the water, although Congo Wood is among the least likely to do this. Tannins are not necessarily harmful to aquarium plants and animals, but they will lower the pH of aquarium water. To reduce the release of tannins, simply boil the driftwood for a few minutes (or longer for larger pieces). If desired, driftwood can be boiled repeatedly until the boiling water does not tan at all in order to completely remove tannins before aquarium use. Otherwise, this driftwood will stop releasing tannins over time with regular aquarium water changes and maintenance. Congo Wood is very dense and typically will sink immediately or, at worst, within a couple of days.