Fish behavior

 if you look at a picture of the tank like this one you notice all the small fish in the tank that could easily be a snack for one of the sharks or even bigger fish. How the fish behave with one another amazes me. It's like they have made a friendship because so far I haven't seen any of the sharks or bigger fish attack the smaller  fish. 

 I noticed the fish's behavior is not as active as it was when I did the last journal entry. One fish in particular stood out to me and it's the fish in the back left corner who has been staying there not moving. I wonder why he isn't swimming around? It is also amazing how all the fish could get along with one another in a small space like a tank, especially that there are predator fish like sharks in the tank.