Spider Wood per Kg

Because of its light weight, spider wood does not sink on its own, unless it is boiled first or anchored down somehow. It's a good idea to boil spider wood before placing it in your tank anyway to make sure it is safe for other aquarium inhabitants.

First and foremost, almost all spider wood will float when placed in water. It can take some time (up to a month for some “stubborn” pieces) to completely sink and will require some effort to do so.

The amount of tannins released by spider wood is much less than Mopani and Malaysian driftwood which is appealing in some cases. Once your spider wood has been submerged there is a potential for a white film to develop. The film is not harmful and will be eaten by some fish, all shrimp, and snails.

The fuzz growing on the driftwood is some sort of bacterial fungus or mold which is harmless to the livestock in your fish tank. It can grow right away, few weeks, or a months after you introduce a piece of new/old driftwood. It is not aesthetically eye pleasing but don't worry too much about it. It's treatable.