If this wasn't a family forum i would have quite a bit to say to you and the original video poster. Just plain cruel and mean. I wish nothing but pain and suffering to anyone who enjoyed this.
There's certainly nothing beneficial for the fish, so the only reason for the video and feeding is to satisfy his own sick fascinations. If you fed your hungry pitbull cats I'm sure animal welfare would be all over you, IMO the guy who made this video doesn't deserve to have any pets of any sort....