Penn Plax Tank Dividers instantly turn one tank into two, providing a separate area for baby fish or for separating rough fish from peaceful tankmates. Easy-to-install clear screens allow for complete heater circulation and unrestricted filtration. Installs without permanent modification of tank – stainless steel clamps clip over frame holding channel in place, then plastic “flo-through” plate slides into channel. When Tank Divider is no longer needed, everything is removed. For odd-sized aquariums, plastic “flo-through” plate may be trimmed to size.