Thanks delsol650 and jedininja.
When I add fish to my tank, I always think about the long term effect to the whole community in my tank. And I was afraid of that the LN hawk mights go psycho one day and eat all my shrimps. I did all the research online and just like here, some says ok and some says no way. I've always wanted to add a flame hawkfish or LN hawkfish. They are just too damn cute..sitting there, watching you and following you as you walk around the tank. My friend has a flame hawk but he doesn't have any shrimp. Everytime I visit him, I always mess with the hawk and it is so cool..that is why I want one in my tank.