Go on youtube and copy the stuff after the "=" on the address bar.
Then on mfk, hit reply and find the YouTube button and paste that between the YT and /YT boxes.
That's not going to work. The URL of the video has the letters "f a g" in it, which the forum censors as *** and causes the URL to break.
The easiest solution is to re-upload the video to YouTube and it will assign it a new random address, probably without the f a g.
I looked at the video and it's hard to tell what they are because the camera doesn't focus on them long enough. You need to take a closeup shot of the fish showing facial markings. I'd say they're probably an altifrons variant but I can't tell if the face is marking-free.