I've had two tank wipeouts (i.e., lose every fish) to my ritteri when it has been disturbed (i.e., when it needed to be moved from one tank to another). It even managed to kill a fish that was in the tank I moved it out from once, it released enough of whatever it releases when defensive (probably a huge explosion of nematocysts) in the 30 seconds it took me to remove it from that tank. The fairy wrasse came to explore the space that was suddenly open, 10 minutes later he was dead. The other times I lost yellow tangs, blennies, a gorgeous potter's angel, and another fairy wrasse. I hate moving that thing. I now keep it in a fishless system, the grief that it causes me is just not worth it.
Although I never lost fish to my carpet because I kept it in a fishless system, after it outgrew my system and I sold it, I heard that it ate all kinds of fish. Moorish Idol, tangs, chromis, etc. etc. etc.
Anemones need to be a very carefully measured choice. If you love your fish, tread carefully, is my advice.