Now that im home and can see better pics, first is Synaptids, related to sea cucumbers and commonly called medussa worms although not a worm at all. They are detrivores and similar to various holothuroids, the standard feeding behavior of reef-dwelling synaptids is to anchor about 1/3 of the body into some secure hole, and then extend the anterior 2/3 of the body to feed (they can do the water balloon trick with only part of their body if they desire.
Second worm looks like a spaghetti worm or other terebellid