01-18-2011, 01:57 PM
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So I have 3 platies in a 5 gallon tank. The guy at my LFS sold me a Marineland 10w heater, saying that it should keep my tank around 75 degrees. Unfortunately, the temp of the water seems to fluctuate directly with the temp of the room I keep the tank in. I program my thermostat to drop to around 59 when I go to bed, and when I wake up, the water temp is at 71. When I'm home and the heat in the house is on, the temp of the water is 75 or so. I know fish are not fans of temperature fluctuations.
I ended up getting a Hydor THEO 25w heater, which has a temperature knob, but the same thing is happening. The temp in the tank with go as the room temp goes. Do you think the fish care about a 4-5 degree change every day? Should I try both heaters at the same time?