It is a 100% "Hoplias malabaricus". They are kinda inactive and mostly lie in a corner all day long, you should feed at night and try to make it used to dead foods, if it don't accept it take out a shrimp/fish fillet and knot it to a wire (im a swede hope you understand) and make it look like its alive in the tank, he will learn to accept that sooner or later. You don't need a large aquarium I'd say you are good with a 120cm long aquarium, 300 litre. If you feed it living food you will never be able to have this monster with another fish, I tried with a Syn. Eupterus that was like 2" longer and much fatter and it went straight ahead and bit it. Luckily I was there to get it out before it had another bite cause the "Hoplias malabaricus" would have torn the Synodontis into pieces (for real).
Excellent fish, and BTW you need much filtration but they dont need extra air pumps etc.
/tuda
