A. We don't understand the comment from the person at the aquarium store. If you have two or more heaters, of course they are going to counter balance each other, turning on and off when necessary. In reality, having more than one heater in your aquarium is a very good idea. If one heater fails, you're not stuck without a backup.
Something else to consider is that if you live in an area that is very cold in the winter, one heater may be stressed to keep up with low temperature fluctuations during those long winter months.
For more information about this topic, refer to Heating Your Aquarium - Using & Choosing Heaters, and Heater Set Up Resources.
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