I have no good pictures. It was shrinking at a notable rate, and didn't take frozen foods, so I think it may have either been a coral-eater or would have fed on something that just isn't present in aquariums. I euthanized it with clove oil to save it the trouble of starving to death- don't know if flatworms can feel distress at starving, but I didn't want to just let it die slowly. I'll see if I can get a couple of my not-good pictures uploaded.