That one isn't an A. Hystrix, it does appear to be either an acanthicus or pseudacanthicus. Could be an A. adonis, but unlikely.heres another, with more spots on its fin.. Fin-Spotted Acanthicus
hmm, I just googled that, and didn't come up with that pic. odd.http://www.molluscan.com/fish/exploration3/acanthicus2.jpg i googled giant pleco i think
When I click on the link it is. when i just manually type that it, they aren't.