This is a tough one, but if I were to put my money on anything I'd say Teugelsi as well.
It's very hard too tell from the pattern and colors, looks like it could match both Teugelsi and Palmas Buettikoferi, and even Retropinnis I suppose. The fish does however seem to have the elongate appearance of a Teugelsi, and I've never seen a Buettikoferi with a head that flat.
Full, detailed side pictures please. Worst case scenario we'll count the scales lol.
If it really is a Teugelsi, then I suppose this is the real-life equivalent of legendary raid drop. It's arguable the rarest UJ poly you'll find in the hobby, even those actively looking for one will have a hard time landing one.