Stealth Heater are junk.....I had a 250w with my large datnoids and I couldnt figure out...that when I put my hand in the tank....... with a few cuts on my fingers...it would burn and sting the cuts......I thought it was bad water quality...so I took out my sand....cleaned the filters.... and still no change. I thought it was due to the ph....but little did I know that the stealth heater was producing an electric current in Datnoid tank. I figured this out...that when I put aluminum foil on the top of the tank..it sparked. I would never recommend a stealt heater to anyone!!!!!!! Luckily I caught it on time!!!! Just letting monsterfishkeepers know and to watch out!
Daniel
Daniel