I'm sure someone will snatch him up fast also idk about where you live but there are a couple fish stores in my area where they would take em, not to sell but to keep as their own pet. They are always looking for fish like piranhas. My kids had a ghost knife he was so cool, they are so cute like a lil blind man sticking his head out of his cave sucking up brine shrimp like a Hoover vacuum cleaner!I do love knife fish. I've had a couple African and Black Ghost knife fish, but a piranha is a different story, haha.
I imagine that someone will take him, but if not, I'll keep you in mind.