When I set up my 29g years ago, I bought to True Perculas. After about 2 years, one jumped out of the tank, through a very narrow spot. Honestly, it had a 50/50 chance of falling right back into the tank, but chose the wrong way to wriggle.
It was very sad, as they were a beautiful pair. I still have the other one, that is now 7 years old. It has mated with a False Percula and lays eggs every 2 weeks.