Galapagos Cholla Wood is actually a fallen, desert cactus skeleton! It's porous and fibrous texture attract shrimps and aquatic microfauna. They are naturally good anchors for growing aquatic plants and look very intriguing underwater. The Cholla Wood has natural tannins that lower aquatic pH gradually and naturally! Cholla Wood is also classic wood decoration for desert terrariums home to desert snakes, geckos, chameleons, dragons, and iguanas! They even make natural perches for all birds.