I've only kept one bearded dragon- a young adult male rescue- but I think 3 x 2 x 2 is okay for young dragons, & too small for an adult. 2' height might be too much, also, because the UVB lights they require get less effective as the distance increases. Just a heads up...
I know that breeders or retailers often have the babies kept together but just so you know, some of them usually end up being unsalable (or dead) because some dragons will chew off the feet or tails of other dragons. I don't know what age that stops, but dragons are predators first, & buddies second.
One other thought: I seem to recall seeing photos of groups of beardies raised by the author* outside in a warm climate in HUGE enclosed areas (with bales of hay to bask on- if that gives you a sense of the space). I think the safety of co-habbing has a lot to do with how much space & cover they have, "much more" being highly preferred.
*May I recommend: General Care & Maintenance of Bearded Dragons, by Phillippe de Vosjoli & Robert Mailloux (You can buy this used for a couple bucks online)
There may be other, more recent, books out there too, that I'm not personally aware of (it's been years since I had the dragon), but doing more research never hurts. And I don't have my copy of this any longer, as I had no plans for another dragon & figured someone else needed this more than my bookshelf did.
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