Pygmy Chameleon pairs?

I've been thinking for a while on getting a pair of Pygmy Chameleons. Can they be housed together in the same enclosure or are they like the larger chameleons and need to be separated?
 
Can my little guy within the next few days or week, can't wait! I'd recommend at least a 10g for a pair but a 15g or 20g would be even better.
 
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