They sort of look like polyps which fluoresce green under blue light. In the video and photo, I’ve extracted using a feeding tube and placed in a 100ml plastic cup. The cup is resting on top of the d-d jump guard pro mesh lid which has 8mm x 8mm grid size to give some sense of scale.
Tank is a Fluval evo 52L nano.
Photos below of wider shot of tank and mid shot for context of where I found them.
I’ve seen posts elsewhere suggesting it might be from their hammer coral. I have the green octospawn close by with white tips - this does have aiptasia so potentially a stress response?



