behaviors

So my discus are ALWAYS peaceful little guys (or big in this case). I have always been curious about their behavior while and after eating. They get really aggressive towards one another and it climaxes at one point. It's a really intriguing thing to watch. Anyways, I capture the whole event on...

Have (4) Geophagus aereos. One fish was getting picked on and looked stressed: removed to another tank - doing fine now. Another is clearly hiding from the "main" two. Could this be pairing behavior or are these fish just plain mean? Paul. Thanks.