Your sand bed is incredibly clean for a year old tank! And it's on a dead/bleached coral? Do you keep other types of anemone or corals? Tell us what your water parameters are, just good doesn't tell us much. I wouldn't feed it again, that can be stressful and it shouldn't need freezing anyway. Your lighting should be enough for it to survive. If the tank is a year old have you wet changed the bulbs? T5 need to be replaced about every 8 months.