I've got an 8" Naso, a decet sized hippo, and a yellow in my tank now. My plan was to add one last tang in my 180, the Powder Blue.
I think I've decided against it. Too aggressive from what I've read, and ich magnets. As it is, 4 tangs in my 180 might be pushing it. I really love the PBT, but I'm thinking the negatives outweigh the positives.