I was thinking that maybe they could pick on each other. When he used to do this with my black ghost he never even ripped his fin, they were like an old married couple that loves each other but loves to fight, they used to hang out together amicably as well all the time.
I think he just does it to pass the time, my previous eel that was over 2' was very very chill (with any established tank mate, new ones he killed), but the eel I have now gets pissed off more easily I'm afraid I'm going to find him dead. I make sure to have good amount of snails so he can stalk things and he has plenty of his own space, he's not defending territory he's invading. I want to direct his behavior some where else thats why I was wondering if I could introduce a mate or friend of his own kind