I had a batch of monos this season that looked like they may of been plezonia. That same batch was also sold to 1 wholsaler in the chicago land area. In which makes me think your fish are from the same batch. I havent seen baby plezonia before, but in my eyes what we had was very close to them and looked just like yours. Yours are right around the same size range as ours would be now. I think that batch is plezonia,, it makes total sence. Keep us all updated with pictures of these fish.
Thanks,
John