had that prob with my butter he was just over 500 eating like a pig once I paired him up he stopped eating last I weighted he only lost like 20 grams or so he was down to like 495 or something but I stopped pairing him and he still wont eat been like 2 months .. my other guy I threw in to complete the job is slamming what ever I throw his was ... its the most annoying thing .. anyways I was just reading a article with a 395g 5 months getting the job done