When a coral or anemone becomes bleached, it loses its color and turns white. This means that the photosynthetic bacteria and algae living inside of its tissue has died, and it can no longer make food for itself from the light. So being bleached is a bad thing. If your anemone or coral is bleached, you will need to hand feed it every day, since it can't feed itself anymore. There is a chance that it can get its color back, but usually they just die of starvation eventually.