The 12Pcs Aquarium Fish Tank Divider Plastic Egg Crate Aquarium Filter Bottom Tray Grid Isolation Board Partition Net Pane Separator is perfect for dividing your aquarium into multiple compartments. The durable plastic material is safe for use in an aquarium and will not produce harmful effects on the water quality. The set includes 12 pieces that are easy to use and can be cut to any size to fit your fish tank.