If it was my tank I'd go for larger shoals of fewer species. It looks a lot more natural.
As for the rasboras, have a look at Trigonostigma espei. They are very similar to harlequins, but a little bit smaller, so you can have more, and personally I do like the copper sheen they have.
As for the rasboras, have a look at Trigonostigma espei. They are very similar to harlequins, but a little bit smaller, so you can have more, and personally I do like the copper sheen they have.