This all depends on the size of the tang. They get big and have a tendency to be aggressive! Your tank is on the smaller size for that tang. I would recommend no less than 200 gal and preferably more. Or, make sure you have a person with a larger tank ready to adopt him when he outgrows your system. I have a Dussumieri in my 125g. She is ready to be released back to the wild in just over two years and, really, should have released her sooner. My 2c.