Now that the puffers are going to a new home, there will be some free bio-load and I'm thinking of adding a Tang or two. I currently have a single large Powder Brown Tang that is very dominant. What is the best strategy for adding tangs? I have read that having a total of two Tangs is a bad idea - better to have at least three to spread the aggression around. Should I get small Tangs or ones larger than the Powder Brown? Are there different types of tangs that are better to be introduced last?