All fish will eventually eat PE mysis, well all except the smallest gobies. It took several months but even my garden eels eat pe which is almost as large as their heads and they are afraid of everything.
Firefish, small wrasses, chromis, clownfish ect have all taken to pe for me.
When a fish is right out of the ocean I will feed brine to get them eating but after that I rarely feed, pe probably consists of 80-95% of the food I feed my fish with the exception of tangs and other fish that eat nori or other veggie based foods.