You're gonna have to be more specific than that.
"Looks like an oto" - does that just mean a general sucking type fish.
Or a little more particular: Does that mean very similar size and shape ?
Are you sure that's what it was labled at ?
How much was it selling for ?
It looks like an Oto - but is not the sucking type - has spots and whiskers.
Sorry I'm at a complete loss to think how that remotely looks like an Oto - or what it could be ! Perhaps someone else has a better imagination than I do !