No, unless there are fry that like to swim near the bottom.
I think yoyos and zebras are the same species(botia), but have a different color pattern, but the design is always zebra.
Puffers would also work pretty well, but IDK if they would get along with swordtails.
Puffers would work great, except they don't really get along with any fish well. You will always be running the risk of them tearing your swords to shreds.