Lol okay thank you for answering all of my questions. Sorry about my nit-pickyness. I am very particular when it comes to my knowledge of betta keeping...I think i will set my heater at 78 which will allow it to drop to 76
First, every Betta can be different in their tolerance to water temp for many different reasons.-With that said, lots of information is often based on misinformation and/or myths too. Tropical water temps start in the 70's and this can vary by region. Wild Betta native environment temps can range from high 60's to 100'sF depending on season, rains, drought, day, night- as well as varied temps at different levels in the water. Some of temps are gradual changes and/or short term, however, when going from drought to rainy season-not only will they experience a sudden extreme temp change-but a chemistry change as well-that they tolerate. I don't really like to compare our domesticated Betta with their wild cousin-but in some area there is not much difference. Overall-for long term keeping-it is best to try and maintain a somewhat stable temp and avoid sudden extremes, however, the gradual temps that can normally occur are generally tolerated by a healthy Betta.
A healthy Betta can tolerate varied temp ranges IMO/E...
IME-keeping my Bettas in the lower normal temp range increases longevity due to metabolism effect of cold blooded fish. You also can have larger and healthier colonies of pathogens that can become pathogenic in higher water temp. I generally keep most of my Betta in temp ranges of 72F-76F(more or less) long term. As long as the Betta isn't showing any signs of stress/problems-I don't over stress about water temps-provided that I am dealing with a healthy Betta to start with.