i dont target feed mine at all. the only one that gets target fed is the red coco worm. the others get left overs from the feeding of my corals. hope that helps.
Here's some info on HOW to feed one, from Rob Toonen:
"One thing I do want to make clear, however, is that worms feed from the bottom up. I always find it somewhat amusing when I see a well-meaning hobbyist try to target feed their worm by squirting some sort of particulate food into the center of the crown. Target feeding is difficult enough because the worms typically withdraw into their tubes as soon as they sense the current generated by spraying food towards them. However, most people are rather shocked to discover that the current is generated from the outside of the tentacles as water is drawn upwards into the crown from underneath and expelled towards the center of the ring on the upper side. Thus, by directing target feeding streams towards the center of the crown, even those worms that don't retract immediately get little to no food from that well-intentioned effort because the food will be blown away from the animal by the feeding current it generates (the center of the crown is where their waste water gets pumped away -- by target feeding the center of the crown, you're effectively trying to feed their butts). Therefore, if you are trying to feed a feather duster worm, you should be directing the food to the side and below the crown, where it will be drawn through the feeding tentacles and feed the worm. By creating water flow through the feeding tentacles, the worms actually use the eddies generated by having a branch of their crown in the flow (similar to a rock in a stream causes a swirling eddy which pulls objects in behind the rock) to cause food particles to swirl around that branch and get captured on the upper surface of the tentacle."
