I've only had my Tiberius a few days and his tendencies are already starting to show. He... gets distracted. REALLY easily. Like the other day I put a rock in his tank. Just a plain, smooth rock. I did it as I was feeding him so he would hopefully be focused on eating and not be scared. He wasn't scared, but he got distracted from eating and decided to stare at the rock and dart around it, trying to figure out what it was.
Also, he likes to stare at my cats, like he's taunting them, cos he knows they can't get in his tank