You'll never get near a Eunicid worm with a turkey baster. They retract like lightning and rarely do they extend themselves fully from their holes.
You can confirm you've got a Eunicid worm with a quick peek at my posted tank shots.
I have one that does tend to eat Xenia, but it doesn't eat any SPS
, mushrooms, toadstool leather or clam. In fact, mine seems to mostly vegitarian although they are clearly not very fussy.
Here's my best guess on catching one. Tame it with regular feedings. They can be coaxed out with something smelly and eventually they get used to it. If you can coax him out far enough you'll at least be able to grab it. He'll break in two before you can pull him out of the hole, but at least he'll be smaller and might not survive the ordeal. Mine also tend to be more active when the pumps are off...
...I have a tank which is a touch more untamed than most.
40 Gal Hex, 10 Gal Sump, CPR overflow with Mag 7 return, Maxxima 35 RO
, 10K MH
pendant, 2 x 15W actinic, 1 yellow tail damsel, 1 high fin goby, 40lbs LR
.com rock, 1 red head goby, 1 algae blenny, Leather, blastomussa, sun, and hammer corals, green polyps, carpet anemone, 2 sexy shrimp...and more LR
critters than you could imagine in your worst nightmares.... Mantis in 5 gal