Hand sorting even 100-200 FHM is not that time consuming. Get yourself an aquariurm net 5"-6" wide, dip out 5-10 minnows at a time and quickly visually check each one as they are transfered. For sorting you are looking for unwanted: sunfish, catfish-bullhead types, sticklebacks, maybe a bass. If FHM were raised by the farm very doubtful there will be carp, suckers or shad present as could be the case with bait shop minnows.
