Cholla Wood (5-6 Inches) for aquarium shrimp, invertebrates and fish You get one organic piece of Cholla Wood of approximately 5-6 inches long and 05.1.5 in diameter Cholla wood helps lower pH and benefits invertebrates, fish and plants that prefer acidic water Great for aquarium decor while providing hiding places for small fish and invertebrates. You can mount mosses or other aquatic plants on it Attracts biofilm which is the main food source for shrimp Cholla wood can be used as is or boiled in water first before introducing to aquarium to remove excess tannins. Please read product description