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I have a Whisper 200-watt submersible heater. The heater only gets the tank to 72 degrees. Is the heater too small, defective, or do I just need to add a second heater?
I have a 300 W in my 58 gal and it can get the temp up to 88F (for ich treatment) no prob. I'd get another 200W - that way, if one dies, at least your tank will never drop below 72.
What tank size is your heater rated for because different brands of heaters have different ratings. If your brand is rated for your tank size then it is more than likely defective if not then I would by a higher wattage heater.