from the looks of it..it should grow bak if the onditions are right...plae him t bottom. at least vho lighting. when hes open target feed with baster a little shrip meaty foods etc 2 weekly but not too much. dont move it around too muh. plae it where therres moderate water flow then leave it alone. too muh handling is no good. and make sure it has a sandy bottom. 2-3 months it should recover 50 perent more and so on...brains are pretty hardy.:happy: good luk