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I had not considered it as possible cephalopod (or any mollusk for that matter). I was quite surprised that when the lights were on the fish were not gorging themselves on these little guys which were visible to the unaided eye. Maybe they were full already. Thanks again for the feedback!

Larval form? My initial thought was that it was a larval form as well. I didn't see any antennae or obvious appendages, weird. I have not seen them the last couple of days but there were easily 100 or so of them swimming around. The tank is 55g saltwater with liverock. The rock is about 12...

I have found these free swimming (not on the glass) in my aquarium the last several mornings. They are about 0.7mm long and move by means of a scissor action of their tails. Any thoughts as to what they are?