I just dealt with these guys again a few months ago. I believe I encountered two types of worms. This is just my hypothesis and could be way off. One type seemed to like to eat the tissue from the base up. The second type ate the tissue in random areas all over the coral leaving "bite" marks. This could be the same type feeding in two different ways. I also found some that were large and generally clear and some that were small and brown. Again, could be the same type in different stages of development.
Here is a picture of an acro with a large egg mass and you can also see one of the small brown FW's in the upper right of the pic.
BTW, I still have this coral. I set it out to dry as it was so severly infected that I felt there was no hope and I didn't want to bother with all of those eggs that were there. When I first found eggs and that 1 FW I loooked the coral over for a good 10 minutes with a magnifying glass and couldn't find any more FW's. To my suprise, after the coral dried out for a day, I saw about 10-15 more FW's on the branches. The FW's still appeared moist on the dry acro. I don't know if it would be of any use, but I could send you this acro. The eggs are still there and I believe the FW's are still visible. Maybe you could check and see if the eggs can still be hatched out after adding them to a tank.
<img src=http://notlehs.com/travis/AEFW/AEFW%20on%20valida%204-7-06.jpg>
After finding that I had the FW's again I decided to treat all of my acros. After the first levamisle 40ppm treatment for 5 hours many of the adults were only "stunned" and still stuck to the bottom of the treatment tank. I siphoned them into a 5 gallon bucket as I was going to save them but they all died. Here is a picture of some of them in the bucket. When you consider the size of a 5 gallon bucket, you can easily see that some of these were quite large.
<img src=http://notlehs.com/travis/AEFW/142_4224.JPG>