Pacific Driftwood Medium (6"+)A handsome, dense driftwood piece similar to Malaysian Driftwood, but with much more interesting texture. These are a must have for shrimp tanks, as they provide shelter for breeding, edible bio films, and wonderful tannins in the water as they break down. They are also useful as a Ph buffer in quantities. Untreated Pacific driftwood will eventually break down in the aquarium. This is a completely desirable and natural process, and makes your shrimp