Nope.
I would refain from training him to jump; you might wake up one day to find that e has jumped out of the tank or wacked the tank lid.
If you want to keep his mind busy, buy a little pingpong ball and place it in the tank, he'll have fun chasing it. Or live foods, some even like dried banana leafs or almond leafs in their tanks.
But using a mirror only winds them up if you do it constantly, people think it's healthy but when they flare, they are releasing andrenaline throughout their body. Not always a good thing, when there is not anything else to take it out on but then that is my theory.