lacks the small dorsal fin of the other two, so is actually fairly easy to distinguish.
The two Kryptopterus
species are nearly identical except for size, K. bicirrhis
gets quite a bit larger. The two were actually considered the same species for over 100 years, until the late 80's or early 90's. Most glass catfish offered in the trade are K. minor
, and most retailers I've come across don't distinguish between "ghost" catfish or "glass" catfish, They're all sold as glass catfish.