Crystal Clear Aquatics AAD00332 Frag Crate Coral Propagation Grid, 12 by 12-Inch, Black Frag crate-coral propagation grid is designed to optimize growing conditions for your propagated corals Algae is less likely to accumulate on the all black structure and is visually appealing while it is securely and conveniently showcasing coral frags Frag crate can easily be cut to any size or shape and combined to assemble into multiple layers or shelves Available in black color Measures 12-inch length by 12-inch width