Dont hate me because your fish jumped. Im just speaking the truth
I did say usually. There are 3 main factors, Tank size, Fish personality, and tank mates. Any fish will jump if it is in small tank, if it is a skitish fish or gets scared easily, and If it has tankmates which dominate, chase, or scare the fish.
If regals arn't skittish it would almost be impossible for the fish to jump out of a large tank housed alone same goes for any non jumpy fish.
In your case i would guess another fish chased it or scared it.
I think a lot of the time we find ourselves covering our tanks due to the tanks being overstocked. If people kept 4 or 5 compatible fish in 200 gal tanks they would most likely not need covers and the living situation for the fish would be much better. Thats what i mean when i say the fish that jump most likely shouldn't have been there. I think a cover can be a cheap fix for an overpopulated tank.