crystal-zoo Crystal Acrylic Aquarium Isolation Double Grid Box 1. Air holes by design 2. Easy to install, easy to clean 3. Dimensions: About 7.87 * 3.94 * 5.91 inch 4. The imported acrylic, safe non-toxic, lets in light as high as 92% and above 5. Before installing, remove the protective film, install the product according to the instructions