Well, I have 12 javanica (plus unknown number of nymphs) and 7 portentosa (plus nymphs)together, so far no dead babies, no fighting, they're doing just fine. It will be interesting to see them multiply. I've been raising tarantulas too long, I was expecting the portentosa males to start static, or kill some javanica over food, but they all chill together very well. Nymphs seem to be ignored by both species.