Sorry. I don't know any better. I don't know what's fake and what's not online anymore. I need to just stop posting stuff I think.
They don't look fake to me in that video at least. But they are so cool that they look like they should be fake. I know sometimes people play around with contrast to make things look more vibrant than they actually are, but it might not be the case here. Sea creatures are crazy looking sometimes!
No need to stop posting. If you are ever unsure, then read the comments from the video or article.. if a lot of people say it's fake, then it might be ;p