Mogurako
Aquarium Advice Addict
IMO they should be culled or used as feeder by you, ideally they should not leave your tanks. Unless you have to sell or give them away for the the soul purpose of being feeders. in which case they should be sold/give to someone who will let you watch them being used as feeders. That way there is 0% possibility that they are resold and distributed through out the hobby as a pure strain.