Be a bit careful with the hawkfish , they like shrimp so might decide to have a go at any inverts in the tank just saying but they are a nice and unusual fish to add to the aquarium,usually sit on a rock and watch the tank go by.
Lazy buggers ,
I've met a few hawkfish over the years on sites that I've worked on
Go for it if that's what you want ,just think about compatibility with what you have or want to have in the future.
That's the only thing with this hobby you need to plan ahead sometimes before you buy .