Interesting. Asian USD catfish, if that is what it is, do not break 10"-12" most usually
http://www.planetcatfish.com/common/species.php?species_id=21
It looks to me it but it'd be nice to have more and better photos. If it is Mystus leucophasis, it is by far a champion size. Then all bets are off as to its value, as there'd be no precedent.
In terms of housing, they are, again most usually, highly aggressive. I'd not be surprised if it cannot be kept with anything short or long term.
My little bloodthirsty weasel when it was 2" managed to kill three 6" harlequin lancer catfishes by constantly tattering their fins, and stressed badly my three black lancers, killed one trachydoras, etc.
He is ~4" now and has been ok with a 14" Labeo, 3 black sharks, and two common plecos.