Yes. That's been my experience. They are ambush predators that eat pods
along with getting some nutrition from light. If you have a large pod population you'll have a boom, they will eat the pods
gone, and then try to perch on your tallest things to reach for light, like corals.
In some cases a wrasse could either eat them or eat the pod population down so they start to starve out. Years ago i had a massive bloom of red planaria and at that time I added a pair of fairy wrasses. I never saw the wrasses actually eat a flatworm, but shortly after this, they all started to disappear. They were never seen again in that tank, even after a power outage took out the wrasses.