from the pic it looks like it is in a shady spot somewhat, this is good because it is so bleached,don't force it in the light, hopefully it can regain its pigment. Small bits of shrimp or fish to feed it will help it gain its strength back. don't over feed it though and not any big pieces, just like pea size. like once a week a little food which will prompt it to seek energy from the light. So often they do all kinds of chemical crap to them to make them have that bleached look so people look at them and say ooohhh how pretty and buy it. that no matter what you do they die. I always try to get aquacultured anemones for that reason.