76 to 77 is where you want to be! Think of it this way, imagine being outdoors in the bright hot sun on a cool breezy day vs hot day. The bright hot sun being your LEDs, T5s or whatever. If your tank is running at 80 degrees then it's going to have a lot of problems as it is plus then the light source will heat up the corals that much more which can cause them to stress much like our skins burning in the sun, hence, a negative reaction. For soft corals, lower temps help them look better by keeping them tightened in compact form as supposed to it being stretched out in higher temp. When compacted, the corals are more colorful because the skin color pigments are concentrated and overall shape is more beautiful. For example, short thick colorful tentacles on anemones vs long skinny semi colorful tentacles. 78 and 79 is close to 80. This is why I think you should try to keep it between 76 to 77.
A lot of the good things I learned about reefing were through accidents
hahaha. Happy reefing