Hello, I have recently bought a ball python, and it is my very first snake. After I were able to constantly keep the cage temp around 88-92 on hot and 78-85 on cold, I started to add some props like fake leaves, branches to climb if it feels like it, and some tubes.
I wanted to add some small glow-in-the-dark rocks, so the cage looks a little interesting...but my friend who previously had a ball python, said that the ball python will eat the rock and die. I know I am a beginner, and snakes can be a bit dumb at times, but I don't think they are that dumb to swallow a small rock.

The rock isn't a pebble, but more like small stone.