I bought 2. A 150w and a 200w. Could both be defective?! Set both dials to 79 degrees. Tank temp reached 83.5 and still neither heater shuts off. Only when I turned dials to the indicator showing 75 or less do they turn off. ***?
Anyone else using them have advise? Besides getting rid of them at this time that is
Anyone else using them have advise? Besides getting rid of them at this time that is




