Penn Plax Cascade 100 Watt Adjustable Heater Part # CH8100 --- Penn Plax Cascade PF This filter features a Bio-Sponge

This filter features a Bio-Sponge cartridge that optimizes colonization of anaerobic bacteria

If you are running your pump as a "Circulation" pump the part is Part# ML90519

6" Height 6" Width 4 3/4" Depth

Fits/Replacement for Red Sea Max 250 Circulation Pump #1

Penn Plax Cascade 100 Watt Adjustable Heater Part # CH8100 --- Penn Plax Cascade PF This filter features a Bio-SpongePenn Plax Cascade 100 Watt Adjustable Heater Part # CH8100 For 20 Gallon Tank Accurate to 1 Fully Submersible Mount Horizontally or Vertically Factory Preset at 76 Temperature Dial Adjustment Fresh or Saltwater Safe Visible & Accurate Temperature Setting Scale Easy View On Off Light Length 8. 5"