At this point, if you want to save your remaining fish, you might want to get Prime and Tetra SafeStart as soon as possible.
Prime can help detoxify ammonia and nitrite up to 48 hours. If you keep doing water change every day with Prime, you can minimize the damage.
Tetra SafeStart is the only proven working live bacteria product that can speed up the aquarium nitrogen cycle. Get a bottle rated 2x the size of your tank, and dump it all in at once after a new partial water change. Do not change water again for the next day or two.
I have no idea how you have such high water temperature. Do you have a heater? What is the setting on it? Or is it because you have high room temperature?
Keep in mind, there is no guarantee your remaining fish will live through the cycle. Hope for the best while doing your best.
