I am aware of how voracious they can be. We have caught them on rod and reel while fishing patch reefs in Florida. Little guys were 3 inches long and manged to get through a live pogy to a circle hook.
That said, they have amazing personalities.
I found this video of these fish showing spawing behavior
This is exactly what mine is doing minus the color change. My little guy doing push-ups in from of me is pretty interesting. I doubt he wants to spawn with me or my phone, so more than lively an aggressive behavior similar to the breeding dance...
Cool! I was afraid of putting two to a tank. The video may make me change my mind. Mine is with grammas, a yellow assessor, different cardinals and blue stripe pipefish.