I second BGOrchidGuy's comments. AFAIK, ORA sells captive raised peppermints (or at least someone does), peppermints have been raised to adulthood from fry but not cleaners. Again only AFAIK maybe things have changed in the last year or so. From what I understand, the problem with cleaner fry is they tend to get "stuck" to one another and after a few days they are literally one big glob of dead larvae. Weird.

Peppermint spawn and cleaner spawn, they're excellent food. I don't think they so much "pollute" the tank because they just get eaten up so fast, a couple of hours is all it seems to take.