thanks for the help so far guys
maybe a dwarf gourami (is just one okay?)
4-6 cories
possibly some blue ram (how many are suggested? what genders?)
The dwarf gourami will be fine by itself. I have kept single dwarfs numerous times. Groups tend to aggressive with each other. They only get along IME if they are a mated pair. I always wondered why it was the big guys got along fine, but not the dwarfs, but there you are anyway. Singles are awesome centerpieces in tanks. I have one now doing just that.
Rams do well in pairs or quads. Genders aren't relevant, and good luck telling them apart anyway. LOL Or at least, I never bothered with mine, and everybody got along fine.