Feather duster /Coco worm

Sort of jacking this thread. I recently bought a Feather duster/Coco worm, and it not doing to well at all. After climatizing it to my tank and releasing it; it began to spew whitish threads. Poop, if figure. Then over the next couple of days, it became less and less showy. It seems to have deminished in size and now bearly comes out at all. I've tried feeding with phytoplankton to no avail Now just sort of pops out breifly once in a while, usually when the lights are off. Anyone else had a similar experience? Anyone know what could possibly make things better? Would really like to save this guy, as they are very pretty and showy.