The CoscosX 10 Pcs Aquarium Grid Tank Dividers Tray Egg Crate Aquarium Dcor Fish Tank Filter Bottom Isolation Board Partition Net Pane Separator Grid Isolation Board Divider for Mixed Breeding,Black is a perfect way to divide your fish tank into several compartments. These dividers are made of safe and environmentally-friendly plastic that won’t produce any harmful effects on your fish. They’re easy to use and can be cut and spliced together to create any configuration you need.