the lips are a clue right? i cant remember why but they have those big lips for some reason but they decrease when kept in the home aquarium. looks related to an eye biter in that respect. im guessing by the marbled colouration that its also a man made strain not found in the wild..
just remembered why the lips. they suck out stuff from rocks too eat and it swells the lips as they never do this in an aquarium the lips shrink as they are never used.