To answer the first question, yes it is possible to get an anemone to re-gain its supply of Zooxanthellea. However it significantly hurts its chances of survival if somthing should go wrong as it is already in a sense sick. So, pristine water conditions ample lighting is a must for a recovering anem, and supplimental feedings will help. Nothing larger than its mouth every other day or so. Silver sides, clam, shrimp, mysis or any other raw fish. Stay away from the oily types salmon, tuna etc... Hope this helps...