I have a juvenile green terror and a blood parrot in tank together. The other day I noticed the green terror was darker than normal and was sitting at the bottom, looking kinda depressed. I assumed the BP was picking on him, so I rearranged all the landscape so they could re establish their territories to see if that would fix it, before i left for the weekend. I came back last night and checked on them and the green terror swam to the front of the tank and almost seemed like he was happy to see me! He was kinda overly flapping his fins rocking back and forth. Kinda reminded me of a dog who hasn't seen his owner in a while. Is this a characteristic of fish? Do they recognize their owner? I was pretty surprised when i saw him doing this.