Okay, so a friend of mine was breaking down their 10 gallon and asked if I wanted the last inhabitant, a "suckerfish." I assumed it was a pleco, and said that I'd take him and put him in my 55 gallon. When they brought him, I realized he was not a pleco, and I honestly have no idea what he is. I've googled and searched, but still have no idea. I'd appreciate any input.
He's about 4 inches in length.