How do they not fight?

It could be overcrowding comparable to what's sometimes done in African cichlid tanks. There's so many fish packed in that aggression is widely spread amongst everyone, rather than being focused on one or two individuals.
 
read all the video comments.

It's obvious the guy doesn't know what he's doing and the situation (as seen in the video) was temporary.
 
Though they look fantastic together,
I've seen examples on several youtube vids and articles with pics of peoples set ups that have kept several together.

However, to only eventually get rid of a few or switch them all out to other tanks once some grow larger and aggressions increase. The whole tank can get messed up.

Personally, I'm not that interested at this point in keeping one, much less more than one. Though they are beautiful fish. I think Gary as well as most others with experience would agree that to set up such a system with more than one (unless it is a fairly rare pairing) is setting up for failure. Eventually, if not sooner.

For anyone interested here's an
Excerpt from useful articles related on the subject where there are some exceptions, but not really much:



Good Grouping Species:
Most Angelfishes live a solitary life, but some wander the reef in small groups of two or three, which are usually mated pairs or trio's of one male and several females. It is not uncommon for multiple males and sometimes females placed in the same aquarium to fight, often to the death, and although many Angelfishes do best when kept singly, one to an aquarium, here are some species that can be kept together under the right conditions.

•Lemonpeel Angelfish (Centropyge flavissimus) -- Makes a good pair, and a trio of one male and two females can be kept in no less than a 100 gallon aquarium.

•Cherub Angelfish (Centropyge argi) -- Good for pairing and two or more females can be kept together, but only as long as the tank is at least 50 gallons in size and they are all added at the same time.

•Blackspot Angelfish (Genicanthus melanospilos) -- Can be kept in small groups in a larger aquarium, but with only one male present.

•Herald's Angelfish (Centropye heraldi) -- Makes a good male-female pair, but in a minimum 75 gallon aquarium.

•Bicolor Angelfish (Centropyge bicolor) -- Can be kept with other individuals, but only in a minimum 75 gallon aquarium and all are added simultaneously.

Pairing Angelfishes:
So how do you know if you are getting a mated pair of Angels, or two that are going to beat each other up? Apparently when it comes to the pairing of Angelfishes, size plays a role here, and color may as well. To learn more about the matching up of a mated pair of Angelfishes, let two of Hawaii's top marine biology experts explain it to you.


Aquarium Introduction Tips:
Extreme dominate or territorial aggression occurs most often when an Angelfish has been established for some in an aquarium and a new tank mate is introduced. If you are going to add an Angel to your aquarium community, it is suggested, unless otherwise noted, that it be introduced into the tank last.
When decided to keep multiple Angelfishes in the same aquarium it is best to choose mated pairs, species that commune well together, or pick dissimilar species, and then introduce them into the tank all at the same time.

•About Sexing Angelfishes
About Sexing Angelfishes:
How can you tell if an Angelfish is male or female? For an answer to this question we contacted two of Hawaii's top marine biologists and asked them how to, if at all possible, do you determine the sex of, as an example, a Flame Angelfish. Here are their responses.

•Richard L. Pyle, Ph.D., Associate Zoologist/Ichthyologist, Database Coordinator, B.P. Bishop Museum, Honolulu, Hawai'i -- "The males seem to have more blue on the soft dorsal and anal, and seem to have pointed soft dorsal and anal fins instead of rounded. However, I don't think anyone has really carefully examined this to see if the correlation is really sex-related, or just size-related."

•J. Charles Delbeek, Live Exhibits Department, Waikiki Aquarium, Honolulu, Hawai'i -- "I agree with Richard's assessment. Although it is not proven, I have used the differences in fin shape to create pairs that have spawned. Also the easiest way to obtain a pair is to buy two fish of differing sizes. The larger one will be, or will become a male, while the smaller will be female. To be sure, the size difference should be as great as possible."
As these two expert's opinions and experiences reflect in their answers, there is still much research to be done on the sexing of fishes, but size might be a key when it comes to identifying the sex of a Flame, and possibly other Angelfishes. -END

I've seen of a few people that have successfully kept mated pairs. As well as public aquariums that do it. (Think Aquarium Niagara) has still or had, a sexed pair of French Angels together. In one tank with not much else in it at all.
 
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Deep blue could you cite that article it looks like a great read! Also maybe others could use it as well :)

Thanks
 
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