I think that is the fish from the genius Rivulus or any another of family Cuprinodontidae.

It is certainly not a Rivulus, nor a cyprinodontid, cyprinodontids for once only have one dorsal fin. Rivulus also only occurs in South and Central America.

This is most likely some species of goby, but I cannot say of which family/genus/species, but might be of the Gobiidae.

its a marine goby. Possibly Ptereleotris sp. but waiting for expert answers.