3 Pieces 4 inches Long Natural Cholla Wood for Aquarium Decoration Shrimp Crab Pleco by SoShrimp Three pieces of Cholla Wood. 100% Natural and Organic. 4 inches long, 0.5 - 1.5 inch diameter. Great for aquarium decorations, mounting plants or moss. Attracts biofilm which is the main food source for shrimp.