The thing about that anemone is it is really sticky. If a really sick (or dead) fish (my fish was sick after the flatworm treatment) got caught on the edge, the anemone could have used its sticky tentacles to pull it in to its mouth, no problem. It is a bummer, but I am so relieved to have taken care of the flatworm problem. That would have caused much more trauma in my tank in the long run. Things are starting to get back to normal. I'd like to replace the tang with an Angel (Coral beauty would be ideal, but a flame angel is cool too), but I know they are usually not reef safe.