Nano getting too hot?

I'm in the process of starting my first 28gal Nano JBJ LED. Im almost finished with my cycle but the tank seems to be running hot. My air is set at 75 degrees and the tank is running around 80-81 degrees. I bought a heater but it has been unplugged. Has anyone else had these issues? Moving into winter, the heat will be set at 68 so I'm sure the tank will cool off but do I need to do something different in the summer?