Suggestions! What other fish should I add to my tank?

It's a 16 gallon bowfront and I already have a red platy and dwarf gourami (think it's called blue/powder puff) so it's almost cycled and when it is what else would be fun and colorful? I kind of have in mind: another kind of dwarf gourami, some dwarf corydoras, and either a snail or bristlenose pleco or some sort of algae eater...(not really interested in guppies, platys, or tetras but more unique) Thanks!