I think you’re going to get a lot of answers here in that range from 76-83. I went for 78 as I’ve kept a lot of tanks at that temp and has better O2 at that level vs a higher temp.
I set mine to stay within a degree of the temperature the tank seems to run near without it. I use hydros to control my heater on one system and INKBIRD on the other. No complaints for either control system here.
In my home with our thermostat settings 77.5 works well without ever going above 78 in summer and the heaters aren’t running continuously in winter.