Very interesting, I never saw a BGK with a dorsal fin? I wonder if this is a Aba aba? That's the thing with common names like "Bala Shark" is not really a shark and so on...........I saw a few in a LFS here in Iceland yesterday, was very surprised. I have owned a "normal" BGK before and was about to post a thread about this hi-fin BGK when i saw this thread. Didnt take any pics but they were 2-3" and costs the same as normal BGK go for here in Iceland.
Very interesting fish
The dorsal fin was about 1/3 of the fish´s length.
Edit: of course one pic would clear this mystery up