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I think it could be possible, but it is hard just keeping several inca in the same 75g. Maybe that is actually what they need to keep from fighting amongst themselves. Just watch carefully, and have a backup plan ready.
I am very interested in how things progress, I just got a pair of trifasciata(in QT) over the weekend, and I have a 75 with 1 male and 4 female inca.