My RBTA is healthy as heck and it lives in the center of a cluster of three green nepthea. Most soft corals will withstand the anemone sting and or sting back. Some of the more sensitive softies like yellow fiji toadstool and some other toadstools don't seem to like the anemone sting but they don't die. I keep My RBTA in a 75 gallon stuffed with 35 different species of soft corals, sinularia, lobophyton, nepthea, mushrooms, zoanthids, pallythoas, star polyps and so on. So far everything has been touched at some point by my anemone or previous RBT anemones and been fine. Star polyps will say closed up for a while when stung and the fiji yellow toadstool gets tissue necrosis from being stung. Nothing too major so I never had any real problem.