Hydor 15W MINI HEATER for Bettas and Aquariums, 5-10 gal Suitable for marine and tropical aquariums Extra small - easy to hide in mini tanks and bowls Super Safe - no damage if left running dry Submersible for 5 to 10 gallon tanks Suitable for marine and tropical aquariums Extra small - easy to hide in mini tanks and bowls Super Safe - no damage if left running dry Submersible for 5 to 10 gallon tanks