Fish for new future tank - advice needed

Hi All,

I am hunting around for some possible fish for my future tank. I am
getting it in April after we move, right now I plan on getting a 3ft
tank I think that's 45-50g or thereabouts.

Anyway the main fish I want to get is a breeding pair of Blue Acaras. I
was wondering if the tank would be big enough. Other fish I was
thinking about are either some Dwarf or Regular Gouramis or 4-6 Barbs
of some sort or breeding pair of Kribensis or a combination of these or
any other suggestions.

Also wondering what kind of filter and substrate would be best for the
blue acaras.

Thanks in advance!!