Yes, It is Columbian Shark exanematichthys (ariaus) seemanni. I will post some pictures of mine in anew thread. They do best with two or more as they are a schooling fish. I kept mine for many years in a brackish tank. The did great. I used a choral gravel which buffers the pH to pretty much a constant 7.8 level. I added about 1 heaping tablespoon of marine salt per 2 gallons of water. They get to about 12 to 14 inches. So they require a large well filtered tank. There are lots of great brackkish fish and many that will do well in brackish. Scats, Dats, puffers, and many cichlids. Iw ould get a second one if I were you. They are quite a good looking fish.