Hawkfish especially flames become aholes when mature. Really cool fish but they do get nasty.
Take a look at the Golden Midas Blenny. This is a favorite in my tank from most people that have seen it. They swim in the middle water column most of the time, they'll also find a hole in LR that will become their home and it's fun watching them back into the hole

Lots of personality and they get to about 6" full grown. They'll eat anything you offer them and are complete pigs :lmao: Great golden yellow color and very active. They get along with all fish in the tank, no aggression what so ever.