My problem is that I cannot find any information on it other than what it eats. I would like to know more about its habits so that I could try breeding it, if possible. The biggest problem with this species is that it does not stay the same as it matures. Oh yes, it does stay ugly and might even get uglier, but it grows to almost 2 feet in length and eats almost anything it can get into its not too small mouth. It is a member of the family Gobidae, and the American Fisheries Society has given it the official common name of the violet goby.
Dragon fish is a trade name to help it sell.
The primary range of this fish seems to be the low-salinity, muddy marsh habitats of the Gulf of Mexico and the Caribbean. It can be found on offshore sand bottoms and will ascend rivers to pure freshwater. Its range is from Charleston, South Carolina, all along the Atlantic and Gulf coasts to Rio de Janeiro, Brazil. To my knowledge, it has not been successfully bred in the home aquarium, but it should not be too difficult if a large enough tank is provided and both sexes are present. I cannot even tell you how to determine the sex of the fish, as the only times I have seen mature fish in any quantity have been in collecting seines in southern Mexico.