Start feeding when they get their first worker.
What location did you find three of them together?
Yes, they love crushed unsalted unflavored sunflower seeds. They also love wingless fruit flies as well as grapes and fruits. You can freeze the fruit flies and feed them if it's only a few workers in a test tube. What is interesting about young colonies is they won't drink sweets from a drop on a tinfoil or bottle cap, but they will drink from a feeder, like from byFormica. Not sure why.
They do not need foraging area til you get the first workers. They are also huge water drinkers. One of my biggest mistakes in my first year of rearing them was not providing enough water for them to drink. Always keep a sweets liquid feeder along with a water feeder.
They do excellent in a THA Fortress. Start with that, don't use a mini hearth. That's too small.
Best of luck! 
Two days ago, I caught 3 queens under the same rock and decided it would be a fun idea to throw them into the same test tube. They're already laying eggs and they haven't fought yet. I have some questions though:
When should I start feeding them? I heard sunflower seeds and crickets are best for them for their picky taste buds.
They need sugar? If so, what is the optimal sugar to water ratio?
Do they need a foraging area as of now? When will they need one if not?
Would they do well in a Fortress? If not now, when?
Do they need to be heated? If so, what do you use to heat up your ants?
This may be a bit impulsive, but I'm just really curious to see how it all unfolds. Thanks!
OK, once I get that Fortress over here I'll move them in and by then hopefully they'll have a nanitic. I'm pretty sure it takes more than 2 and a half weeks for them to grow egg to adult, however.
I'm assuming that from your response, any sweet is viable? Like raw honey will do? I think there's ant nectar and hummingbird nectar but I'm not sure how I can make it work for ants. I will, however, make sure that sweets are available for them once they get their first nanitic. Thanks for that!
I also wasn't sure about frozen fruit flies but sounds like I'll be giving them a shot! Once it grows bigger, if it does, I'll start feeding fruit.
Should I just get all of my feeders(sweets, feeder machines, etc.) from byFormica? They're very reputable and I just want to be clear so I know I can just get my supplies from one store.
Thanks for your help, even though I'm literally asking for more 
EDIT:
Just realized polygyny maybe wasn't a thing for them, however, pleometrosis(temporary cooperation to build a nest) was. They'll eventually kill each other, and I'm not sure if I want to let the dominant and strongest rule and kill or just send off the other two. If I do decided to let them go, I'm not sure when to separate them, I really only want one colony. Some experimenters conducted a test with 8 pairs of N. Cockerelli and 7 of the 8 would eventually have a dominant queen kill off the other. I'll keep this in mind, however, just for curiosity's sake, I find it best that I should keep them together and let the magic happen.
DOCUMENT: http://psyche.entclu.../96/96-131.html
Edited by Solenoqueen, August 12 2019 - 10:18 PM.
