Ok first off i'd like to say its late and im a bit tired but here it goes. Do fish know what they are, for instance does a pirahna know its a pirahna? I put a caribe in my largest tank today and about three of the tank mates flew over to the other side of the tank and took a good hard look at there new tank mate. The caribe nearly bit him in half but just stopped an instance before he got to the new guy (probably thought it was a feeder) and they all just stared at him for a good 5 seconds, then they all turned around and swam away. I don't know really know how to explain it I just thought it was really wierd like they said to each other "oh hes one of us"