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This reply is a bit late, but I have the answer to your question. Generally, you can keep as much roaches you can in a single enclosure until you see signs of cannibilism/stress. Sings of this are - eaten/clipped antennae, chewed wings, eating the recently molted, eaten/dropped egg cases, and aggressiveness. (Males will fight if you have too many) Also the smell can indicate overcrowding. As far as feeding goes, I ONLY feed off adult males and male nymphs. The females are too valuable to feed off, one female equals 200 babies. One male can fertilize 10 females in it's lifetime, so start with the ratio 1:10 and feed off the males (I do 2 dozen a week or so) until you have roughly one male per 10 females. You can do 1:5 though. I don't like too many males since they simply compete with food, and sometimes eat newborn babies.
So how big a colony, or how many would I need to feed off a couple of dozen a day?
I need to go back and look at your pics of the diff in the male and female nymphs. The adults are no brainers, but I need to be able to spot the young males for feeding better / quicker.