Marineland Stealth 100 Visi-therm Submersible Aquarium Heater

Had the stealth heater for 8 months and 6 hours after a feeding I found all my fish dead and the water temp was 100 degrees. The thermostat feature probably stuck on and cooked em'. I hadn't adjusted it since I first set it up. Watch out!

Pros: Durable

Cons: Kills Fish

I purchased this heater after my aquatic turtles shattered my glass submersible heater. I love it. It is easy to keep clean. It keeps the tank at a consistent temperature even though I turn my home's heat down to 60 degrees during the days of winter. My turtles like to use it to get a boost closer to their warming light but the suction cups can't hold their weight so it is usually just floating around the bottom of the tank banging up against the glass and I don't even worry about it.

Pros: tough shatterproof case, accurate temperature

Cons: suction cups not strong enough to hold turtles