My feather duster lost it's plume 3 days after putting it in the tank. I found comfort in seeing that it was still alive and moving inside its tube. A few days after that I noticed that my emerald crab was munching on the furthest back part of its tube, we scared the crab off (not sure if it was a good thing or not). Last night I go for a drink of water after lights out, and the worm was hanging outside of the tube, almost completely. In the morning, the tube had fallen over and was on it's side in the direction the worm was hanging the night before. I wasn't able to see the actual worm this morning. Question: Dead, moving, sick, what? Tankmates include: Emerald crab, yellow tail damsel, blue green chromis, and 2 turbo snails. Thanks for any info or advice lended.