Estone 5PC Divider Sheet Holder Suction Cup For Aquarium Fish Tank These are suction cup based aquarium divider holders. You can easily divide your tank into several compartments with these divider holders. Use these divider holders for separations of different fish, for breeding and to prevent your fish to fight as well. Handy clips to divide a bigger fish tank into several compartment for breeding or separation Easy to install in your aquarium tank Slot Width At The Bottom: Approx. 10 mm Slot Width At The Top: Approx. 5 mm