Flatworms in the genus Waminoa. These contain algal endosymbionts and studies of the digestive tract have failed to find any nematocysts so it's unlikely that they feed on the corals. The problem with them is that without predators in the tank they'll multiply to plague proportions and shade out the photosynethic corals. There are certainly a lot of posts here on RC on the best way to deal with them.
These don't tend to multiply and spread like Convolutriloba which is the common red flatworm. They usually just stay confined to whatever coral they came in on. Personally, I wouldn't do anything unless they start to spread.
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