Wait until you have good, stable water parameters for at least a week (after you cycle) before you add jawfish. Also look into adding come small rubble so he can build a den.
Any peaceful fish well be fine with a jawfish. I introduced mine along with 2 small clowns and they got along fine. My gramma found a hole in the LR
above his home and that was the only time I saw any territorial behavior. If the gramma got too close, the jawfish would open it's mouth at him, almost like a cat's hiss; never chased/harmed each other.