this works....but
this works....but
is a bit of a pain
Set up a separate tank inline with the main system. Put the peppermints in it with the rock/aptasia's. Rotated the rocks when they were cleaned up.
Mine ate any/all sizes of aptasia, then ate each other...
They were not fed anything else and were voracious, almost piranha like. Fun to watch...for a while.
All of the rocks were cleaned up in a matter of a couple of weeks.
Good luck