I would need to know the species of the "long fin" to comment; if it is a long-fin form of the Bristlenose, then the same would apply as it is the same species. Common names can be misleading as they may apply to various fish quite different from each other.
The "dwarf" species of rasbora generally are not as good in large tanks, since they can get "lost" in the space. The Galaxy and Emerald rasbora come into this. Check the profiles.
Most of the dwarf cichlids are much the same in their requirements, with some variation. Several are in our profiles.