you can Qt that fish for the next 5years and as soon as you put it in with that yellow, it is highly likely it will get ick. I'm not say you shouldn't QT fish but you didn't so it really is kinda late to worry about doing now. PBs are notoriously a bit on the aggressive side as compared with the yellow, and since the yellow is the smaller of the 2 I am fairly certain once that PB gets accustomed to your tank (a couple weeks or so), the ick will disappear and the yellow will know he is not the ruler of the kingdom. Of course all fish are a little different. Follow the advice above and feed, and let it settle down and I'd bet the yellow will do NO more puffing and harrassing. He will step down. JME
Rob
215g sps tank w/90g sump, Emperor Angel, 5 Tangs (Sailfin, 2-yellow, purple & powder brown), pair of GSM clowns, pink spotted and yellow watchman gobies, mandarin, Dwarf lionfish, pair of yellow tail damsels, red coris wrasse, Harlequins