I got a new king Betta for my five gallon fluval chi because my old crowntail "Majesty" jumped out. Because Majesty jumped out, I am in the process of designing a DIY lid out of an old tank divider. The lid should be ready tomorrow. Until then I have placed hornwort across the surface of the water to discourage jumping while allowing my new king Betta to come to the surface to breathe.
Here are some pics:



The hornwort barrier:


Here are some pics:



The hornwort barrier:




