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Most people on here will tell you 78 degrees is fine for most freshwater fish. I keep my two community tanks at 78 and my african cichlids at about 81, but they are fine at 78-82.
Most of the fish do best between 76ºF-79ºF, but since there are so many different fish with different requirements, there is no one 'ideal' temperature.
I keep my tanks set at between 75 and 80 degrees depending on what species of fish inhabit them. I usually do some checking at www.fishprofiles.com and elsewhere to see what conditions are best. What types of fish do you have?