I've had this lap for close to a month now and I have seen no progress in this. My LFS had him for a solid 4-5 months before i finally felt bad and got him. His tail/fin has been like this since the first time ive saw him. I have not noticed any growth (length or girth) in the month I've owned him also. Im feeding him tilapia, salmon, krill, and massivore. Could his growth be stunted?