Quinn,
Usually I place my fish in isolation for several days before releasing, just to be sure. It's like medicating, if you cut it short too soon, you might not get the full benefit. It's also less stressful to go through one extended (4-5 days) period than have to be caught up again if the fighting continues and go through a second isolation period. JME
The yellow tang ignoring it though is a good sign. My second tang circled the cage for the week and still gave the third a couple of days of chasing until they decided to call a truce. Since yours are 2 dif. spp. it should be a lot easier.
Good luck.
Anthony