We should entertain that the list of viable tank mates is quite limited, at least for tanks 29gal or smaller lol. While it is frequently posted that females are likely peaceful and tolerant, that may just be relative to typical-day male behavior. Our male harasses the females at random times throughout the day yet eats peacefully next to otos when scavenging tiny bits of algae wafer and lets them go about their business without hassle. We have attempted keeping corydora and rubbernose pleco with and quickly removed them from the environment due to the females acting as aggressors.
We acquired three of our females from a LFS called "The Fish Tank" in Daytona, FL and drove them back to Louisville. At a later date we ordered a male/2 female package from Wild Fish Tanks and all fish were in excellent condition upon arrival and continue to thrive.
Hoping the best for you and your goals!