The use of cf. in a scientific name (for example Polypterus cf. Koliba) means that the person using the name is saying the fish should be compared to a given species, as it might not be exactly the same species.
I've had 2 cf. Koliba in 2014 and returned one back to a store (not wet spot) for credit a few months later. My buddy still has this silver variety and hasn't grown over a foot yet. CB characteristics still remains and would say it's on the lesser quality side.