So I found this after a dip of a coral that wasn't doing so well. It doesn't look like the usual suspects, maybe one of you with a keen eye can ID it.
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I'm not entirely sure (so hopefully others will chime in here too), but you might have an AEFW infestation, with the one you got pics of that came off in the dip being a well-fed juvenile.
THANK YOU! I knew you'd be the one to verify my suspicions. At 0.4mm I knew they weren't adults, and my dip in KCL and subsequent inspection under UV and Red light found no adults. But there are eggs, so there must be adults present, and I will keep searching.I'm not entirely sure (so hopefully others will chime in here too), but you might have an AEFW infestation, with the one you got pics of that came off in the dip being a well-fed juvenile.
For reference:
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What Are Acropora Eating Flatworms And How To Treat Them | Reef Builders | The Reef and Saltwater Aquarium Blog
Acropora Eating Flatworms (AEFW) are an SPS reefers nightmare. One day you can go from a pristine reef to a fully blown out plague just by introducing them with one coral. Amakusaplana acroporae…reefbuilders.com

