I am setting up a 55 gallon brackish tank. To start with and then graduate the fish to a 200 gallon when appropriate. I wanted to run some target fish with some monos and columbian sharks. I was asking at the LFS if they could get some target fish he said he had one. It was in full marine conditions already. He said this would not be a good idea to have target fish as they are very aggressive. Has anyone had the same problem? He said that they will attack just about anything. Any info would be appreciated.