sorry its not very good they wont play ball today, i think its a baby feathfin syno! The large adult feather fin has a large filament thread from his dorsal fin and its only one, while this baby as u can see lots of small ones . any ideas? maybe its a male and a female? ,nope it seems feather fins have one or many filaments....... sheesh no wonder they common name is feather, just used to one adult with a large filament that reaches this tail ( think it goes past it)