I have raised hundreds of bob white quail. We incubate and hatch our own for dog training.
Quail from day one have an extremely curious nature among other traits. They will peck and peck and peck at almost anything and when confined even in large areas and will almost always peck at each others nostrils,eyes, feet, or bums at some point. If they end up drawing blood or the victim has even the slightest difference in looks they will continue to peck away until death.
Nothing I have ever tried works like beak trimming.
I have tried red lights, low to zero light, red enclosures, increased heat, decreased heat, more space per bird, treats, toys and distractions, higher protein food, different brands of food. Mine always start picking at either nostrils or bums after about a week, so much so that I was losing about 20% of my hatch to picking.
I totally resisted beak trimming as a last resort and it has turned out to be the miracle I had hoped for with all the other things that I had tried but had failed.
When chicks are about 1 week old use a pair of sharp fingernail clippers and just snip off the tip of the upper beak. It's quick and pretty easy. Sometimes they will bleed just a drop or two but with a seconds pressure against the nick it stops almost immediately.
Or you can use a styptic pencil or even just plain old cornstarch to stop the minor bleeding.
They will still act as though they are pecking at each other but will do lots less damage as beak tip is now blunt instead of needle sharp.
This has not affected eating or drinking in any way. I do have to trim again when babies are about 6-8 weeks old but I find that the aggressive picking seems to lessen some as the birds age.
Occasionally you will have an overly aggressive hen or cock once they are mature, my theory there is that those should be culled as they will only breed more aggressive chicks in the future if breeding is your purpose.