The AQUA KT 6 PCS Aquarium Fish Tank Divider Plastic Egg Crate Tray Grid Isolation Bottom Board Fish Separator is a practical and convenient way to keep your fish safe and separated. Made of safe plastic material, it is easy on the hands and the environment. The white tray is 30 cm x 15 cm and comes with six dividers that are each 11. 81 cm x 5. 90 cm.