Chuck's Addiction is the best photo site for reefers -
http://home2.pacific.net.ph/~sweetyummy42/index.html He lives in the Philippines where he can pick up a constant supply of live rock and critters directly from the reefs. There are various types of worm databases but not one that combines pictures and life history information for a lot of species. If you search for the genera names Capitella, Heteromastus, Mediomastus, and Notomastus (there are more than that) you'll find images. If you do a search for a genus name & another term like "food" "diet" "life history" "feeding" "behavior" you'll find out more about them.