Join Date: May 2019
Location: Palm Springs, CA
Quint is right about the corys--they're happier in schools. Never had any of the pygmies, but I've read they & the other tiny corys are more mid-level fish and not bottom scavengers. If you're just looking for something to clean up uneaten food & algae, snails work as well as shrimp. Get nerites if you don't want them to breed--they come in lots of cool colors & patterns.
If you're doing a low bioload 10 gal, get 6 or more each of tiny fish species: tetras, rasboras, endlers, etc. That way you can get larger numbers of each kind so they're happier and show schooling behavior which is always fun to watch. And the littler guys are less likely to eat shrimp--except maybe their fry. You'd probably need a separate shrimp-only tank if you're planning to breed them. Otherwise they make a good clean up crew, and are fun to watch
Platys get kinda big and poop a lot IME. My biggest newbie mistake was getting one of everything that appealed to me. They survived but weren't happy, and don't live as long. Pick 2-3 species you like, and get enough that they can exhibit their natural behaviors.