Hey friends! I am a noob at salt water aquariums. I am keeping a twenty gallon saltwater aquarium with a fire fish, some hermit crabs and a peppermint shrimp. I am going to be moving into a new apartment with a 75 gallon that I would like to turn it into a a salt water tank. I really wanted to get a tomato clown but when I went to the local aquarium store they had one in what looked like a 50 something tall with a yellow tang and a damsel. The clown was giving little nips at the other fish. I'm sure I could keep other fish for the size of tank I have. How would I keep down aggression? How do people have these large tanks with more aggressive fish like tangs and clowns from dominating the other fish?