You could do shrimp, CPOs, DPs, Scarlet Badis, and there are MANY small fish out there that would be good. Some of my favorite small fish would have to be the chili rasboras and celestial pearl danios. But there are more than just those options, but many more. However like what thekoimaiden said, we would need to know some of your water qualities. Most fish can adapt to most water, but shrimp and other fish that are sensitive cannot.
The best way to help is to be forgiving. People aren't made with a book of ultimate information in their head. We need to inform, not insult; give advice, not lectures; and realize we're all human and we all make mistakes