Keep one by itself, it's basically a sad turd. Keep it with another or a group, they become like little puppies, wiggling and begging for food and playing all day.
not squeaking, it breathes air from the surface, swims up, takes a big gulp (thats the noise you hear)
its a spotted port hoplo, I have 1 but mine has larger, darker spots on it. They grow to roughly 8 inches, are very social, and are bubble nest builders! I do believe they are a relative of the cory catfishes