i would do the 1 firefish and 1 chromis, in that order. firefish are not aggressive to others but usually harass each other unless you get a species that is known to school (i think scissor-tails do); mind you, in a tank that small, I don't know if schooling would work. Most people that buy groups of chromis eventually end up with 1 survivor in the end.
edit: +1 with the others. sixlines can be aggressive, royal grammas even more so. you might just be SOL.
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