Hey Sally,
This is Ray, I have a mandy that eats flatworms and I have an internal refugium for the pods. However He has never decimated the population in my main tank and I feed him with supplemental rotifers, brine shrimp, zooplankton, etc. So far after 2 years he is going great. I do notice that he has figured out to hang out near the fuge outtakes though. That is where most of pods get swept into the main tank.
Ray