I dunno why they do it. I've had more than 1 in different tanks for several years and then they jumped. I also had most of the tank covered.
Jawfish are known for that.
One I had for 5-6 years in my 150 gallon and it still jumped out a small crack in the back.
Ive lost more fish to jumping than ever to disease. Seems like any little hole or I even had an angel jump through the slit in my lights.
Most of them were fish I had for years so seems weird.
Had a
blue hippo jump after 8 years. I had the glass off the tank though never thinking that fish would jump.
Sorry about Jerry (thats why I never name my fish lol) and do try to cover every hole but I know it's hard with summer heat.
kass