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sorry, I forgot to mention that the heater IS turning on and off. it is a 200 watt heater which is a little large for the tank and the temperature difference, I know (45g tank and 0-4 degree temp difference). the reason I went with it is because in the winter it will turn into more like a 10+...
the temperature is measured inside the tank with a mercury thermometer suctioned to the side. I know the thermometer works because at room temperature it was correct and when I filled the tank it dropped to the 50 or so degrees the water was from the outside faucet. I'm not saying it is accurate...
I have my 45 gallon tank setup. I have two guppies in there to cycle it (from what I understand the stress on the fish shouldn't be too bad in a tank that size while it is cycling). I am happy with how everything has turned out except for two things:
1. Current. I have a 40 gallon rated air...