1 Spider Wood Driftwood piece Available size: (11-17") Every piece is different, our expert team of aquascapers pick out the best pieces. These are beautiful and would be a great edition to any tank! Perfect for attaching Moss, Anubias, Java fern, or Buce! Like other driftwood, Spider Wood will release beneficial tannins into the water. Spider Wood does not immediately sink in the water so you will have to weigh it down in your tank. Other options include boiling the wood to speed up the process and then soaking it in a bucket with a weight on top to hold it underwater if it does not sink.