Yea it's the weirdest thing. He only does it to the other Pleco, who is about half his size he's a big bully. I need to check out the pic, is it a thread or an album....
They are definatly interesting. I think what irritates my dad about his (i think its a spotted pleco) is that it's turning agressive and won't let the smaller (blackish colored) pleco suck on the glass. I never could understand why he put more than one in there anyways. His tank is a 55 gallon.
I bet he does freak them out. My dad's Pleco scares little children and my ten year old neice calls him an alien. LOL. Have you ever seen any that get only to four inches? I have heard of them but some say they can get mixed up easy at the petstore with the common plecos.