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Baby colors show nothing about sex. Most of the colors have distinct male and female colors, though they don't get those until they are at least 3 weeks old. Other than that, you can tell males and females apart because the males will get red/rust/pink colored feathers around their vents...females don't get those. But again, this doesn't happen until at least 3 weeks old, usually 4-5 weeks. Just and FYI, bibs are not indicative of sex! I have had nicely bibbed females. But if you have some dark ones that start to develop a white bib, chances are those are boys.
Many people keep them in plastic rubbermaid totes. Cut a hole in the lid and cover it with window screen wire or 1/2" hardware cloth for ventilation. These work great. If you keep more than one pair you can cut a hole in the side of the tote rather than the top, that way you'd be able to stack them and they'd still have good ventilation.