"tr0b3" wrote in
oups.com:

I have recently aquired a 3 inch "Synodontis Nigriventris" (Upside Down
Catfish). Although this fish does swim entirely upside down, it to does
not exhibit many of the other identification marks of a true
Nigriventris. The fish is entirely black with long wiskers and
resembles a Arius Seemanni much more than a Nigriventris.

You have a Mystus leucophasis, "Asian upside down catfish" there. It is a
medium-sized (up to 7-8") predator and not suitable for community tanks or
for small aquariums.

Liisa