Blue Hippo will do u nicely. The yellow tang will try to establish itself with it, but they look nothing alike and will not be too concerned with em. Naso, dont go there. They get too big, and they arent as great as blue hippos, by far. So go that way. But those arent too many fish for a 100. You got plenty of room. Some people are too scared to put in a couple of fish, but that's what tanks are for. Just make sure the fish arent too big, feed them accordingly, and use good judgement basically.