He has had it bit off a couple times and the odd thing is it grows back the same way everytime , thought it might grow back normal but it dose'nt . Nice looking Caribe Welsher7 , i have seen coloration stem off into the dorsal fin and also the tail fin ie. on a Caribe and Red Belly , cool thing is it wont fade with age , atleast not on the ones i have seen and have had in past years . How long have you had him ?