i had flat worms on my new LPS, didn't ID the species, so I started looking up ultra reef safe wrasses, and found the pink stripe, possum and yellow cories wrasses to be suitable for biological control. While I was searching for fish locally in stores, turns out my dragonettes took care of them, within a few weeks. I have a pair of both spotted dragonettes and scooter blennies with them, not sure which species ate them. (my mandarin pair is in the main display, but I think they will eat them also). The initial problem I had, was the dragonettes would eat all the flatworms off rocks and dirty glass, but they wouldn't go over the LPS head. Well given time, they did.