colombian catfish

Hi, does anyone here have experience with any Ariopsis species other than Ariopsis seemanni, the Colombian shark? This includes: Ariopsis assimilis Ariopsis guatemalensis Ariopsis felis

Just left the LFS, where they had a few baby fish they had labeled as RTC x Colombian catfish, which I've never heard of. I googled the name in every variation I could think of and found nothing. They Look almost exactly like RTC's, but no red at all, just mostly pitch black with a...