you have an infestation of copepods... i'd get a fish to cut down on them... but first, you should find out why you have so many...
my thoughts are that you over feed your tank... pods are the clean up crew... if there are so many that they are starting to eat corals, then you have a problem... you can also be growing a algae that is growing on the zoas... that's probably what they are really eating... or maybe your zoas are sick... if they are sick, then the pods and worms will come in and finish eating the infected rotted flesh...
go grab a nice wrasse... but also cut down on your feeding... anytime you have a ton of pods or bristle worms, it's from over feeding...
get a 6line wrasse... them things eat ERRYTHANG!!!...