Blue Acara Questions.

Hi, I was wondering if anyone can help me out with a few questions
regarding Blue Acara's.

I am looking at getting a 3 foot tank in the next couple of months and
as thinking of getting a pair of blue acaras.

I was just wondering if the tank I am getting will be ok for 2 Blue
acaras or should I just get 1? And also what kind of fish can i keep
with them? I was thinking along the lines of some Tiger barbs and Dwarf
Gourami (maybe too small? so regular sized gourmi?)

Also are they hard to get in australia? I don't want to get my heart
set on them and find I can't get them or they are really hard to find.

Finially how do you tell them apart from Green Terror's? I have been
reading around this group/the internet and it appears that sometimes
Green Terrors are sold as Blue Acaras?

Thanks so much! Mariachi