Fluval P50 Submersible Aquarium Heater – 50W, Preset 76-78°F for Freshwater & Saltwater Tanks up to 15 Gal, Shatterproof, Fully Submersible, LED Indicator, Durable & Safe Fish Tank Heater is up for auction in Pet Supplies. The current bid is $3.50, 85% below the $23.62 MSRP, in As Is condition. This auction has ended — similar items appear in live auctions regularly.