07-29-2008, 11:26 PM
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I can see maybe putting one in temporarily if the tank water gets too cold for some reason...but it's summer time now, we are all in the same general area. There's no need for a heater to be running in a fish tank with goldfish in the summer time. The water would just be too warm, depleting the tank of oxygen that the goldfish so desperately need. With a tank size of 55 gallons+ the temperature should be able to remain relatively constant and not change as quickly over the course of time. I keep my 2 fancies in a 75 gallon tank. Never have, nor will I ever run a heater, and my water naturally fluctuates in the summer and winter, but never to the point of concern. Granted you have A/C in the summer, and heat in the winter, it should not really change all that much. Over in Connecticut we have some bitter cold winters as well, but my tank never has dropped to temperatures lower than 65.
If anything, a chiller would be more necessary in the summer months.