From what I've seen with my own anemone, I'm pretty sure it's the new lighting rather then the Nori. I have an anemone that went from dark red to whitish pink because when it was at the LFS, it was under VHO, now that it's under direct MH it bleached.
Anemones can puke out anything that they don't like, I once had a large
turbo snail that fell inside an anemone while it had it's mouth wide open, I thought the anemone was going to die for sure, after a hour, the anemone deflated and puke out the snail without any problems.
Beng