Three weeks old isn't fully feathered yet. Personally I would have their temp still in the 80s, though whether or not they get cold can depend on the individuals. The best way to tell is to check their behaviour. If they are otherwise calm, but are piling together and climbing all over each...
Two weeks is too early to tell for certain. The one you say if a pharoah hen looks like there might be some red starting in there. You'll be able to tell better in another week.
The first one that you think isn't feather sexable looks like it may be grau fee, which does mean that it is not...
Huddling together like that means that they're either cold or scared.
Pecking could mean that they don't have enough space. It's not a sign of affection.
I would laugh like that too if it weren't almost a real conversation I've been having with the almost 24 year old godson as I try to teach him how to be an adult.
I'm thinking quail stuff and experimental things. No waste feeders, waterers that quail will have a hard time pooping in, mini quail size feeders for oyster shell, etc. There are a lot of useful possibilities!
Maybe some accessibility items for my 20.5 year old cat...
You want your coop to either be 10-12" high or 6' high. One is too low for them to get up enough speed to break their necks when they flush, the other is high enough that they won't be going fast enough to break necks when they flush.
You could so something in between there if you put...
That looked like cecal poop. Quail will have a few of those every day. It contains shed lining of the intestines and is completely normal unless ALL of their poop looks like that.
It really depends on what you have near you. I personally like Bar Ale, but their chick feed is medicated, so I switched brands. The brand I use now is a locally milled brand. Check with your feed store and keep in mind the information in the article I sent you. Locally milled feed is often...
The Purina feed is okay. It will make their poop stink to high heavens, but it will give them the protein they need. Here is an article that may help you find good feed. Buttons do have the same nutritional needs as coturnix...