I Went to my aquarium store and got the Marineland visi-therm 150. It shows you the temperature and is less hot to the touch. The other heater was 200 watts and my pleco burned himself when he went under it. I would rate this heater 8 out of 10. Should I have gotten a 200 watt or is the 150 watt ok? The guy at the aquarium store said I did not need more then 150 watts but my kit came with a 200 watt heater. My tank is a 29 gallon.