Originally Posted by callistra
Yes and 85 is too hot so if you have to keep your house that hot get a fan for the room so it stays cooler.
85degrees F is not that hot, Betta's, since they are tropical fishes usually love water parameters of 23 to 30 degrees C or 75 to 86 degrees F. Since they are tropical fishes being 86 would not do any harm, however it will affect your other fishes since at warmer waters the nitrogen cycle increases and the o2 in the water starts to cycle out faster. [basically drowning your fish slowly].
My tank is 84degrees F, with an air pump and live plants. My fish love it at 83/86 degrees depending on my room temperature.
All fishes have their own temperatures they like the best, and many tropical fishes would love to be in waters above 80 and below 88. Just make sure to have a good air flow, air pump or lots of live plants to produce sufficient oxygen for non-labyrinth breathers.