Gastromyzon zebrinus
Gastromyzon scitulus Note pectoral fin "fences" in male, absent in female. Leading edge of fin looks to be very slightly squarer in male, but no way as clearly as in Sewellia. I checked all mine today after discovering this yesterday. All of them have the feature except this obviously way fatter female.
Pseudogastromyzon cheni Female. This one has almost no red in the dorsal.
Gastromyzon ocellatus. Love the way their scales are so defined.
Martin.