If you have a 120+ gal saltwater or reef tank
Then pinfish are a great addition
Mushutherhinoscorpion
They school and enjoy shrimp quite readily.
Pompano, if you got a little room in a saltwater tank, make an interesting addition, they are millisecond eaters and probably wouldn't be safe with cleaner shrimp or firemouth scallops.
Pompano are cool deep bodied fish. They get a max of about 18 inches.
If you got a decent open saltwater pond, perhaps you could keep Round Scad, a semi-pelagic fish that loves to eat copepods in the wild, they grow about a foot long and prefer somewhat open enviorments.