I would also suspect that with over a hundred and twenty bichirs, at some point you start forgetting where you got them from and what they were labeled as!
that is where you are dead wrong.I have each poly named and they are all recorded in my poly log,size they were when i got them,species,coloring,even where i got them from.I actually can remember each ones name.
check out one of HKN's "FAT BASTARD" SB endlie threads... if I rememer correctly it's dorsal fins are similar to yours....just happens sometimes... nice pick up though Jess..