Inverts such as anemones, coral, shrimp, snails, crabs etc. are much more sensitive to even small changes in water chemistry. How did you acclimate the critter? I assume slowly? Perhaps a moot point now since it's been in there for several days now, but improper acclimation to water that is most probably quite different from that of the LFS where it came from would contribute to making it look like it does in photos 2 & 3. From my experience, my LFS keeps salinity a fair bit lower in his tanks than I do in mine. I think this is the case with many LFS, not sure why, just seems to be what they do. In any case, a salinity swing of several points & probably a large difference in pH will not go over well with a freshly introduced invertebrate.
Looks like it's coming around though and the fact that it is eating and at least trying to attach to something bodes well for recovery & survival. Took my bta a while to acclimate as well & it wouldn't take food for weeks. It had a bit more colour than your nem though. First few times it actually held the food I gave it, the tentacles did not have much 'stick' to them & a cleaner shrimp promptly grabbed the food. After a few months the tentacles were much stickier & these days there's no way the cleaner shrimp can even get near my nems to compete for food.
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