Last weekend, I brought home 6 teenage striped cons and 6 pink cons (thank you SWilkins

)
As some of you know, I like to keep my fish. I don't like to re-home them.
I'm working on a plan on how to keep them all, but I would like to verify that my plan should work (with cons, it's always a bit of a gamble, and I know this).
Two pinks are staying in the 20 gallon upstairs-that's my daughters.
I was going to put two or three in each of our african cichlid tanks.
Two (possibly 3?) would stay in the 29 gallon they're currently in.
Could I put two or three in with my
JD and RTS in my 55 gallon?
The pinks are in the very juevenile stage, so I can't sex them yet.
So far, I think (still kinda young), that we have 2, maybe 3 female striped, and the others seem to be male. They're just barely starting to show sex.
Any thoughts, opinions, and/or suggestions would be greatly appreciated.
I'm still going to try another male with Karma when I re-do her substrate and re-arrange her tank, but she was NOT very cooperative last time I tried it.