Anemones have a bad reputation, but I've had a number of them over the years (used to experiment with cloning) and have lost one coral-a hydnophora I'd gotten from a club meeting in Nashville. When they stay put for a while, they can start to get more aggressive, but I kept everything out of reach. When they clone or move around, I had them walking on corals without damaging them. The ones I had were a weed. I just lost one I paid nearly $200 for (I think-haven't seen it in days and when I did see it last, it looked bad), but have only lost one other in the past (and not to it giving itself a buzz cut, as they are prone to do).