I am pretty sure I have a pair.
A bit of aggression has started again between them and I have noticed that the two being aggressive are never aggressive to each other, and they do spend time together.
As I said I'm not interested in breeding (yet

) but it's nice to know they're happy enough to pair up.
As for the others... they are smaller, so I guess they have some growing up to do, provided there is pairing material (at least one female and at least one male). I suspect all the others are female, but we'll see...
Once I do have two pairs, though, should I re-home the others, to give the pairs more room, or will they be fine?