This, is a FREAKIN SWEET FISH. Well maybe not THAT cool, but I just found em and I like them. They look mean, like a barracuda or something. I'm having trouble pulling up information on them though... So I'm assuming it's probably not a good aquarium fish.
It's called a longnose Killifish, or Fundulus similis
I'm thinking my answer is going to be "Absolutely not, are you crazy!" But I figured I would ask around and see if anyone ever heard of them/ knows anything about em. Thanks!!!