What is an ideal temperature for a tropical fish tank?

I have guppies in one of mine, and with their tendency towards ich (female guppies, when preggers are prone to being chilled, and thus contracting ich) I run mine a little hot, usually 80-82.
My aggressive tank is kept lower, about 76-78.
But on average, any were from 76-80 is fine. But you have to give a little leeway, if it's 75 or 82, they won't die. It's just best to have it around 76-80.
Best of Luck!
 
72-82 degrees is within normal range but it all depends on what type of fish you have. Some tropicals prefer a little on the lower end, some prefer the higher end.
 
72-82 degrees is within normal range but it all depends on what type of fish you have. Some tropicals prefer a little on the lower end, some prefer the higher end.
 
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