Not trying to mess with your trade at all, but my Falco/Spotted hawk is mean as can be towards anything smaller than him.
He's killed sixline wrasee, harassed target gobies, and will kill and eat even the largest peppermint shrimp I put in the tank.
Just my experience with them.
I love the look of the firefish, but I know that my hawk would kill him the second he hits the water.
Again, just MY experience with my hawkfish.
I do however love the way he sits on the rocks, and the way he looks. So until I find a small fish that I REALLY want, I'm keeping the hawk.