Otos yes. I have 2 in my tank
I'm trying Threadfin Rainbows in my RCS tank. They have tiny mouths.
I will also be adding CPDs temporarily till their tank is ready. I have over 100 Cherries and the tank has lots of cover.
Micro Rasboras like Merah are supposedly ok.
Some people are trying Corydoras Hastatus. But they may eat shrimplets.
Scarlet Badis are tiny and cute and you think they'd be ok, but they are a micro predator and love tiny shrimplets.
All Tetras love shrimp AFAIK.