I just got a couple of these guys and one of them is starting to pick on the other. I'm afraid they are tire track eels and won't be able to be together. The store said they are zig zag eels, which some websites say are the same as tire tracks and some say they are different, more peaceful, and smaller than tire tracks. I have them in my 40 gallon right now but will move them to my 150 when they get bigger. If they are tire tracks, will they be okay together in a 150g? I also have rope fish in my 150.