Yea I've never seen any of my fish poop let alone stringy poop. He's a nice plump dude. I have seen my Duncan loose a tentacle before. It was hard to see what it was on the webcam. Wish I was home to see it in person.
I'll keep a look out.
I do feed mysis along with A variety of other frozen (rods, cyclosees (however you spell it), etc)
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You've never seen your fish poop? I see mine poop almost every day. They seem to like to do it next to the wp40s so it crop dusts all of their friends and the corals. Not much need for coral food in my tank.
My fish will poop out something similar to that now and then and I've had all of my fish for at least 1.5 years. Pretty sure it's not a parasite. The tangs eat chaeto if it gets to the DT. It looks stringy in their poop.