How does this even work?

[asylumdown]

I did, I looked at his other videos too, that's been going on for months and yet those fish all look to be in perfect shape. The title of this thread is appropriate. More than anything I want to know what his secret is. When I first started my 90 gallon, I stupidly put a 4inch sail fin in the same tank as a 4 inch purple tang. They were the only fish in the aquarium and they went in at the same time. The purple tang reduced the sail fin to tatters in less than a day! If I hadn't intervened the sail fin wouldn't have made it a week. I'm wondering if the extreme confinement is somehow suppressing their aggression? It's still totally not cool, but if he has some magic sauce I would like to know where to get it